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Boulder, IL 7-Day Weather Forecast
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Boulder Weather Forecast
Boulder, IL Weather Forecast Date: 1117 PM CDT Thu Sep 03 2026
Weather forecast for Boulder, IL
Tonight Lo: 75°F Lo: 24°C |
Tonight... Clear. Lows in the mid 70s. South winds around 5 mph late this evening, becoming light and variable. |
Fri Hi: 99°FHi: 37°C Lo: 75°F Lo: 24°C |
Friday... Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 108. |
Sat Hi: 99°FHi: 37°C Lo: 69°F Lo: 21°C |
Saturday... Mostly sunny. Isolated showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Northwest winds around 5 mph. Chance of rain 20%. Heat index values up to 108. |
| Sun Hi: 91°FHi: 33°C Lo: 69°F Lo: 21°C |
Sunday... Mostly clear. Highs in the lower 90s. Lows in the upper 60s. Heat index values up to 100. |
| Mon Hi: 91°FHi: 33°C Lo: 69°F Lo: 21°C |
Monday... Mostly clear. Highs in the lower 90s. Lows in the upper 60s. Heat index values up to 100. |
| Mon Hi: 91°FHi: 33°C Lo: 69°F Lo: 21°C |
Monday... Mostly clear. Highs in the lower 90s. Lows in the upper 60s. Heat index values up to 100. |
| Tue Hi: 99°FHi: 37°C Lo: 75°F Lo: 24°C |
Tuesday... Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. |
| Wed Hi: 99°FHi: 37°C Lo: 75°F Lo: 24°C |
Wednesday... Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. |
| Wed Hi: 99°FHi: 37°C Lo: 75°F Lo: 24°C |
Wednesday... Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. |
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