County Forecast for Watseka , IL
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031000-
Iroquois-
Including the cities of Watseka and Gilman
251 PM CDT Wed Sep 2 2026

..heat advisory in effect until 9 pm cdt thursday   
Late this afternoon   Mostly sunny. Temperatures in the lower 90s. West winds 5 to 10 mph. Heat index values up to 104.
Tonight   Mostly clear. Humid. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 100 early in the evening.
Thursday   Mostly sunny in the morning, then becoming partly cloudy. A slight chance of showers and thunderstorms late. Hot, humid with highs in the lower 90s. Southwest winds around 5 mph. Chance of precipitation 20 percent. Heat index values up to 103.
Thursday night   Partly cloudy. A slight chance of showers and thunderstorms early in the evening. Humid with lows in the lower 70s. South winds around 5 mph. Chance of precipitation 20 percent.
Friday   Partly cloudy in the morning, then becoming mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southwest winds around 5 mph. Chance of precipitation 20 percent. Heat index values up to 101.
Friday night   Mostly clear in the evening, then becoming partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. South winds around 5 mph. Chance of precipitation 20 percent.
Saturday   Partly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of precipitation 30 percent.
Saturday night   Partly cloudy. Lows in the upper 60s.
Sunday   Partly cloudy. Highs in the mid 80s.
Sunday night   Partly cloudy. Lows in the mid 60s.
Labor day   Mostly sunny in the morning, then becoming partly cloudy. Highs in the mid 80s.
Monday night   Partly cloudy. Lows in the mid 60s.
Tuesday   Partly cloudy. Highs in the mid 80s.
Tuesday night   Partly cloudy. Lows in the upper 60s.
Wednesday   Partly cloudy. Highs in the upper 80s.
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Bryce Anderson image
Bryce Anderson – DTN Meteorologist
More Northern Storms Thursday

Frontal boundary triggers storms from Northwest to Midwest; heat and Edouard's remnants affect the South. » More DTN Weather Commentary

Posted at 12:21PM Wed Sep 2, 2026 CDT
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