County Forecast for Watseka , IL
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040200-
Iroquois-
Including the cities of Watseka and Gilman
156 PM CDT Thu Sep 3 2026

..heat advisory in effect until 7 pm cdt friday   
This afternoon   Mostly sunny. A slight chance of showers and thunderstorms. Hot. Near steady temperature in the lower 90s. Southwest winds 5 to 10 mph. Chance of precipitation 20 percent. Heat index values up to 102.
Tonight   Mostly clear. Humid with lows in the lower 70s. South winds around 5 mph.
Friday   Mostly sunny. Hot, humid with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 104.
Friday night   Mostly clear in the evening, then becoming partly cloudy. A chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Light and variable winds. Chance of precipitation 30 percent.
Saturday   Mostly sunny in the morning, then becoming partly cloudy. A slight chance of showers and thunderstorms. Humid with highs around 90. Northeast winds around 5 mph. Chance of precipitation 20 percent.
Saturday night   Partly cloudy. Lows in the mid 60s.
Sunday   Mostly sunny. Highs in the mid 80s.
Sunday night   Mostly clear. Lows around 60.
Labor day   Mostly sunny. Highs in the mid 80s.
Monday night   Partly cloudy. Lows in the lower 60s.
Tuesday   Partly cloudy. Highs in the upper 80s.
Tuesday night   Partly cloudy. Lows in the lower 70s.
Wednesday   Partly cloudy. Hot with highs in the lower 90s.
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Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Stalled Front Starting to Move Friday
Posted at 12:12PM Thu Sep 3, 2026 CDT
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