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Lake Decatur, IL 7-Day Night Weather Forecast
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Lake Decatur, IL Weather Forecast
Lake Decatur, IL Weather Forecast Date: 617 PM CDT Wed Aug 05 2026
The area/counties/county of: Macon, including the city of Decatur.or toggle through each period.
Tonight... Mostly cloudy with a chance of thunderstorms. A chance of showers this evening, then showers likely after midnight. Lows in the upper 60s. South winds 5 to 10 mph. Chance of rain 70%.
Thursday... Cloudy with showers likely with a chance of thunderstorms in the morning, then partly sunny with a slight chance of showers and thunderstorms in the afternoon. Humid with highs around 80. Southwest winds 5 to 10 mph. Chance of rain 70%.
Thursday Night... Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers. Humid with lows in the upper 60s. South winds around 5 mph. Chance of rain 50%.
Friday... Partly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 80s. Southwest winds 5 to 10 mph. Chance of rain 40%.
Friday Night... Mostly cloudy in the evening, then becoming partly cloudy. A chance of showers in the evening. Humid with lows in the upper 60s. Southwest winds 5 to 10 mph. Chance of rain 40%.
Saturday... Partly sunny in the morning, then clearing. Highs in the mid 80s.
Saturday Night... Mostly clear. Lows in the upper 60s.
Sunday... Mostly sunny. Highs in the upper 80s.
Sunday Night... Partly cloudy. A chance of showers after midnight. Lows in the lower 70s. Chance of rain 30%.
Monday... Mostly sunny. Highs in the upper 80s.
Monday Night... A chance of thunderstorms in the evening. Partly cloudy with a chance of showers. Lows in the lower 70s. Chance of rain 40%.
Tuesday... Partly sunny. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 40%.
Tuesday Night... Mostly cloudy. A chance of showers. Lows in the upper 60s. Highs in the lower 80s. Chance of rain 50%.
POP = Probability of Precipitation
Lake Decatur Radar Loop
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