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Agnew Lake, IL 7-Day Night Weather Forecast
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Agnew Lake, IL Weather Forecast
Agnew Lake, IL Weather Forecast Date: 338 AM CDT Mon Aug 17 2026
The area/counties/county of: Mason, including the city of Havana.or toggle through each period.
Today... Sunny. Highs in the lower 80s. North winds 5 to 10 mph.
Tonight... Mostly clear. Lows in the lower 60s. Northwest winds around 5 mph in the evening, becoming light and variable.
Tuesday... Mostly sunny. Highs in the mid 80s. Southwest winds around 5 mph.
Tuesday Night... Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely after midnight. Lows in the upper 60s. Southwest winds around 5 mph, becoming northwest after midnight. Chance of rain 70%.
Wednesday... A chance of showers in the morning. Mostly cloudy. Highs around 80. North winds around 5 mph. Chance of rain 40%.
Wednesday Night... Partly cloudy. Lows in the lower 60s. Highs in the upper 70s.
Thursday... Partly cloudy. Lows in the lower 60s. Highs in the upper 70s.
Thursday Night... Mostly clear. Lows in the lower 60s. Highs in the lower 80s.
Friday... Mostly clear. Lows in the lower 60s. Highs in the lower 80s.
Saturday... Mostly sunny. Highs in the lower 80s.
Saturday Night... Mostly clear. Lows in the lower 60s. Highs in the upper 70s.
POP = Probability of Precipitation
Agnew Lake Radar Loop
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