Alton, IL Weather Forecast & Current Conditions

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs around 80. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs around 80. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Night: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Mostly cloudy with a 20 percent chance of showers. Highs in the lower 70s. Lows in the mid 50s.

Day: Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs in the upper 70s. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Partly sunny with a 40 percent chance of showers. Highs in the lower 80s.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy. Highs in the lower 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the upper 70s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Day: Partly sunny with a 30 percent chance of showers. Highs in the lower 80s.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Partly sunny. Highs in the lower 80s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the mid 80s.

Night: Partly cloudy. A slight chance of showers after midnight. Lows around 60. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Sunny in the morning, then becoming partly sunny. Highs in the mid 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Night: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy with a 20 percent chance of showers. Highs in the mid 70s.

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. Chance of rain 30 percent.

Day: Partly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy with a slight chance of showers in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent.

Day: Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Night: Partly cloudy. Highs in the upper 70s. Lows in the lower 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Day: Partly sunny with a 30 percent chance of showers. Highs in the mid 80s.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Partly sunny. Highs in the lower 80s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the mid 80s.

Night: Partly cloudy. A slight chance of showers after midnight. Lows around 60. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Mostly cloudy this evening, then clearing. Lows in the mid 50s. Northeast winds around 5 mph.

Day: Mostly sunny. Highs in the mid 70s. North winds around 5 mph.

Night: Partly cloudy. Lows in the lower 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the upper 70s.

Night: Mostly cloudy. Lows in the mid 50s.

Day: Mostly cloudy. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent.

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 30 percent.

Day: Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent.

Night: Partly cloudy. A 20 percent chance of showers. Lows in the upper 50s. Highs in the mid 80s.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.

Night: Partly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph.

Day: Mostly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Day: Partly sunny. Highs in the lower 70s. Northeast winds around 5 mph.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Night: Mostly cloudy. A 20 percent chance of showers. Highs in the lower 70s. Lows in the upper 50s.

Day: Mostly cloudy. A chance of showers, mainly in the morning. Highs in the lower 70s. Chance of rain 40 percent.

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. Chance of rain 40 percent.

Day: Partly sunny. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Night: Partly cloudy with a slight chance of showers in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 60s. Chance of rain 40 percent.

Day: Partly sunny in the morning, then becoming mostly cloudy. A 50 percent chance of showers. Highs in the upper 70s.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the mid 50s. North winds 5 to 10 mph.

Day: Partly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Night: Partly cloudy. Lows in the upper 50s. Highs around 80.

Night: Partly cloudy. Lows in the upper 50s. Highs around 80.

Day: Partly sunny with a 40 percent chance of showers. Highs in the lower 80s.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny in the morning, then becoming mostly cloudy. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Day: Partly sunny with a 40 percent chance of showers. Highs in the lower 80s.

Night: Partly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph.

Day: Mostly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Day: Partly sunny. Highs in the lower 70s. Northeast winds around 5 mph.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Night: Mostly cloudy. A 20 percent chance of showers. Highs in the lower 70s. Lows in the upper 50s.

Day: Mostly cloudy. A chance of showers, mainly in the morning. Highs in the lower 70s. Chance of rain 40 percent.

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. Chance of rain 40 percent.

Day: Partly sunny. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Night: Partly cloudy with a slight chance of showers in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 60s. Chance of rain 40 percent.

Day: Partly sunny in the morning, then becoming mostly cloudy. A 50 percent chance of showers. Highs in the upper 70s.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Night: Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.

Day: Partly sunny with a 30 percent chance of showers. Highs in the lower 80s.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 50s. North winds 5 to 10 mph.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. North winds 5 to 10 mph.

Day: Mostly sunny. Highs in the upper 70s. North winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the upper 70s.

Night: Mostly cloudy. Lows in the mid 50s. Highs in the upper 70s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Partly sunny. Highs around 80.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.

Night: Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Night: Partly cloudy. Lows in the upper 50s. Highs around 80.

Night: Partly cloudy. Lows in the upper 50s. Highs around 80.

Day: Partly sunny with a 30 percent chance of showers. Highs in the lower 80s.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. North winds 5 to 10 mph.

Day: Partly sunny. Highs in the upper 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.

Night: Partly cloudy. Highs around 80. Lows in the mid 50s.

Night: Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.

Day: Partly cloudy. Highs in the mid 80s. Lows in the mid 50s.

Night: Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s.

Day: Partly cloudy. Highs in the mid 80s. Lows in the mid 50s.

Day: Partly sunny with a 40 percent chance of showers. Highs in the upper 80s.

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 50s. North winds 5 to 10 mph.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. North winds 5 to 10 mph.

Day: Mostly sunny. Highs in the upper 70s. North winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the upper 70s.

Night: Mostly cloudy. Lows in the mid 50s. Highs in the upper 70s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Partly sunny. Highs around 80.

Night: Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Night: Partly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Night: Mostly cloudy. Lows in the upper 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Night: Mostly cloudy. Lows in the mid 50s. Northeast winds 5 to 10 mph.

Day: Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s. Northeast winds 5 to 10 mph.

Night: Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.

Night: Partly cloudy. Highs in the mid 70s. Lows around 50.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Day: Mostly cloudy. Highs in the mid 70s. Lows in the lower 50s.

Night: Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.

Night: Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.

Day: Partly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 30 percent.

Night: Partly cloudy. Lows in the mid 50s. North winds 5 to 10 mph.

Day: Mostly sunny. Highs in the mid 70s. North winds 5 to 10 mph.

Night: Partly cloudy. Lows in the lower 50s. Northeast winds around 5 mph.

Day: Mostly sunny. Highs in the upper 70s. Northeast winds around 5 mph.

Night: Partly cloudy. Lows in the mid 50s. Northeast winds around 5 mph in the evening, becoming light and variable.

Day: Mostly sunny. Highs in the upper 70s.

Night: Mostly cloudy. Lows in the mid 50s. Highs in the upper 70s.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.

Day: Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent.

Night: Partly cloudy. Lows in the upper 50s. Highs in the mid 80s.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the upper 50s. Chance of rain 20 percent.

Day: Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.