County Forecast for Watseka , IL
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282230-
Iroquois-
Including the cities of Watseka and Gilman
310 AM CDT Sun Jun 28 2026

...HEAT ADVISORY IN EFFECT FROM NOON CDT /1 PM EDT/ MONDAY TO
10 PM CDT /11 PM EDT/ WEDNESDAY...

Today   Mostly cloudy. Patchy fog early in the morning. A slight chance of showers and thunderstorms late. Highs in the mid 80s. Southeast winds 5 to 10 mph, increasing to 10 to 15 mph in the afternoon. Chance of precipitation 20 percent.
Tonight   Partly cloudy. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph.
Monday   Mostly cloudy. Humid with highs in the lower 90s. South winds 10 to 15 mph. Heat index values up to 105.
Monday night   Mostly clear. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 100 early in the evening.
Tuesday   Sunny, hot with highs in the lower 90s. Southwest winds 5 to 10 mph, increasing to 10 to 15 mph in the afternoon. Heat index values up to 105.
Tuesday night   Clear. Lows in the mid 70s.
Wednesday   Sunny, hot with highs in the mid 90s.
Wednesday night   Clear. Lows in the mid 70s.
Thursday   Mostly sunny. Hot with highs in the mid 90s.
Thursday night   Mostly clear. Lows in the lower 70s.
Friday   Mostly sunny in the morning, then partly cloudy with a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of precipitation 30 percent.
Friday night   Partly cloudy. Lows in the lower 70s.
Independence day   Mostly sunny in the morning, then partly cloudy with a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of precipitation 30 percent.
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DTN Weather Summary

Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Heatwave Starts This Weekend, Continues Through Next Week
Posted at 12:03PM Fri Jun 26, 2026 CDT
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