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Mercer, IL 7-Day Night Weather Forecast
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Mercer, IL Weather Forecast
Mercer, IL Weather Forecast Date: 151 AM CDT Wed Sep 30 2026
The area/counties/county of: Mercer, including the city of Aledo.or toggle through each period.
Rest of Tonight... Showers with a slight chance of thunderstorms. Not as cool with lows in the mid 60s. South winds 5 to 10 mph with gusts up to 20 mph. Chance of rain near 100%.
Wednesday... Showers with a slight chance of thunderstorms. Not as warm. Humid with highs in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100%.
Wednesday Night... Showers likely. Humid with lows in the mid 60s. South winds 5 to 10 mph. Chance of rain 70%.
Thursday... Showers with highs in the lower 70s. South winds around 5 mph, becoming west in the afternoon. Chance of rain near 100%.
Thursday Night... Showers likely, mainly in the evening. Cooler with lows in the mid 50s. North winds around 10 mph. Chance of rain 70%.
Friday... Mostly clear. Highs in the upper 60s. Lows around 50.
Saturday... Mostly clear. Highs in the upper 60s. Lows around 50.
Sunday... Mostly clear. Highs in the upper 60s. Lows around 50.
Sunday Night... Clear. Lows in the mid 40s.
Monday... Mostly clear. Highs in the lower 60s. Lows in the mid 40s.
Monday Night... Mostly clear. Highs in the lower 60s. Lows in the mid 40s.
POP = Probability of Precipitation
Mercer Radar Loop
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