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City of St. Charles, MOSt Charles, MO 7-Day Weather Forecast
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St Charles Weather Forecast
St Charles, MO Weather Forecast Date: 608 PM CDT Wed Sep 09 2026
Weather forecast for St Charles, MO
Tonight Lo: 71°F Lo: 22°C |
Tonight... A chance of thunderstorms. Showers. Lows in the lower 70s. Southeast winds around 5 mph, becoming northeast after midnight. Chance of rain 90%. |
Thu Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Thursday... Cloudy with a chance of thunderstorms. Showers, mainly in the morning. Cooler with highs in the lower 80s. North winds around 5 mph. Chance of rain 90%. |
Fri Hi: 81°FHi: 27°C Lo: 69°F Lo: 21°C |
Friday... Partly sunny. Highs in the lower 80s. East winds around 5 mph. |
| Sat Hi: 89°FHi: 32°C Lo: 70°F Lo: 21°C |
Saturday... Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20%. |
Sun Hi: 90°FHi: 32°C Lo: 70°F Lo: 21°C |
Sunday... Partly cloudy. Highs around 90. Lows around 70. |
Mon Hi: 95°FHi: 35°C Lo: 71°F Lo: 22°C |
Monday... Sunny. Highs in the mid 90s. Heat index values up to 100 in the afternoon. |
| Tue Hi: 89°FHi: 32°C Lo: 69°F Lo: 21°C |
Tuesday... Partly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 80s. Lows in the upper 60s. Chance of rain 40%. |
| Wed Hi: 89°FHi: 32°C Lo: 69°F Lo: 21°C |
Wednesday... Partly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 80s. Lows in the upper 60s. Chance of rain 40%. |
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