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Signal Hill, IL Weather Forecast
Signal Hill, IL Weather Forecast Date: 128 PM CDT Sun Aug 02 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
This Afternoon... Mostly sunny. Highs in the lower 80s. North winds 10 to 15 mph.
Tonight... Mostly clear. Lows in the mid 60s. North winds 5 to 10 mph.
Monday... Sunny. Highs in the mid 80s. Northeast winds around 5 mph.
Monday Night... Mostly clear. Lows in the mid 60s. East winds around 5 mph.
Tuesday... Sunny. Highs in the upper 80s. Southeast winds around 5 mph.
Tuesday Night... Mostly clear. Lows in the mid 60s. Highs in the upper 80s.
Wednesday... Mostly clear. Lows in the mid 60s. Highs in the upper 80s.
Wednesday Night... Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 40%.
Thursday... Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the mid 80s. Chance of rain 50%.
Thursday Night... Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows around 70. Chance of rain 40%.
Friday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40%.
Friday Night... Partly cloudy. A slight chance of showers and thunderstorms. Lows around 70. Highs in the upper 80s. Chance of rain 20%. Heat index values up to 100.
POP = Probability of Precipitation
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