County Forecast for Watseka , IL
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181000-
Iroquois-
Including the cities of Watseka and Gilman
241 PM CDT Thu Sep 17 2026

Late this afternoon   Partly cloudy. A slight chance of showers and thunderstorms. Temperatures in the upper 80s. West winds around 5 mph. Chance of precipitation 20 percent.
Tonight   Mostly cloudy. A chance of thunderstorms in the evening. A chance of showers. A slight chance of thunderstorms after midnight. Humid. Lows in the mid 60s. Northeast winds around 5 mph. Chance of precipitation 40 percent.
Friday   Mostly cloudy. A slight chance of showers early in the morning. A slight chance of showers and thunderstorms late. Highs in the upper 70s. East winds around 5 mph. Chance of precipitation 20 percent.
Friday night   Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms after midnight. A chance of showers after midnight. A chance of thunderstorms late. Lows in the mid 60s. Southeast winds 5 to 10 mph. Chance of precipitation 50 percent.
Saturday   A chance of thunderstorms in the morning. Showers likely. A slight chance of thunderstorms in the afternoon. Humid with highs in the lower 80s. South winds 5 to 10 mph. Chance of precipitation 70 percent.
Saturday night   A chance of thunderstorms in the evening. Showers. A slight chance of thunderstorms after midnight. Humid with lows in the upper 60s. Southeast winds around 5 mph, becoming north after midnight. Chance of precipitation 80 percent.
Sunday   Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of precipitation 50 percent.
Sunday night   Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 50s. Chance of precipitation 60 percent.
Monday   Showers likely in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 60s. Chance of precipitation 60 percent.
Monday night   Mostly cloudy. A chance of showers in the evening. Lows in the mid 50s. Chance of precipitation 50 percent.
Tuesday   Mostly cloudy. Highs in the upper 60s.
Tuesday night   Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 50s.
Wednesday   Partly cloudy in the morning, then becoming mostly cloudy. Highs in the lower 70s.
Wednesday night   Partly cloudy. Lows in the mid 50s.
Thursday   Partly cloudy. Highs in the lower 70s.
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DTN Weather Summary

Bryce Anderson image
Bryce Anderson – DTN Meteorologist
South Dakota Becomes the Target for Heavy Rain Tonight
Posted at 11:33AM Thu Sep 17, 2026 CDT
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