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Boulder, IL 7-Day Night Weather Forecast
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Boulder, IL Weather Forecast
Boulder, IL Weather Forecast Date: 637 PM CDT Fri Sep 04 2026
The area/counties/county of: Clinton County Il, including the cities of: Centralia and Salem.or toggle through each period.
Tonight... Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph this evening, becoming light and variable. Heat index values up to 105 early this evening.
Saturday... Sunny. Isolated showers and thunderstorms in the afternoon. Hot with highs around 100. West winds around 5 mph. Chance of rain 20%. Heat index values up to 109.
Saturday Night... Mostly clear. Lows in the lower 70s. Northeast winds around 5 mph. Heat index values up to 105 early in the evening.
Sunday... Sunny. Highs in the lower 90s. Northeast winds 5 to 10 mph.
Sunday Night... Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph.
Labor Day... Mostly clear. Highs in the lower 90s. Lows in the mid 60s.
Monday Night... Mostly clear. Highs in the lower 90s. Lows in the mid 60s.
Tuesday... Mostly clear. Hot. Highs in the upper 90s. Lows in the lower 70s. Heat index values up to 105.
Wednesday... Mostly clear. Hot. Highs in the upper 90s. Lows in the lower 70s. Heat index values up to 105.
Wednesday Night... Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20%. Heat index values up to 100 early in the evening.
Thursday... Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20%.
Thursday Night... Partly cloudy in the evening, then clearing. Lows in the mid 60s.
POP = Probability of Precipitation
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