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City of St. Charles, ILSt. Charles, IL 7-Day Weather Forecast
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St. Charles Weather Forecast
St. Charles, IL Weather Forecast Date: 306 AM CDT Fri Oct 23 2026
Weather forecast for St. Charles, IL
Morning Hi: 49°FHi: 9°C |
Early This Morning... Mostly clear. Patchy fog. Temperatures in the upper 40s. Light and variable winds, becoming east around 5 mph late. |
| Today Hi: 71°FHi: 22°C Lo: 49°F Lo: 9°C |
Today... Mostly sunny. Patchy fog early in the morning. Highs in the lower 70s. Southeast winds around 5 mph. |
Sat Hi: 71°FHi: 22°C Lo: 49°F Lo: 9°C |
Saturday... Mostly cloudy. Highs in the lower 70s. South winds 5 to 10 mph. |
Sun Hi: 71°FHi: 22°C Lo: 50°F Lo: 10°C |
Sunday... Partly cloudy. Highs in the lower 70s. South winds around 5 mph. |
| Mon Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Monday... Mostly cloudy. Highs in the upper 60s. |
| Tue Hi: 65°FHi: 18°C Lo: 49°F Lo: 9°C |
Tuesday... Mostly cloudy. Highs in the mid 60s. |
| Wed Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Wednesday... Mostly cloudy in the morning, then becoming partly cloudy. Highs in the upper 60s. |
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