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City of O'Fallon, MOO'Fallon, MO 7-Day Weather Forecast
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O'Fallon Weather Forecast
O'Fallon, MO Weather Forecast Date: 529 AM CDT Mon Oct 26 2026
Weather forecast for O'Fallon, MO
Today Hi: 79°FHi: 26°C Lo: 51°F Lo: 11°C |
Today... Mostly sunny. Highs in the upper 70s. Southwest winds around 5 mph. |
Tue Hi: 75°FHi: 24°C Lo: 51°F Lo: 11°C |
Tuesday... Mostly cloudy. Highs in the mid 70s. South winds 5 to 10 mph. |
| Wed Hi: 79°FHi: 26°C Lo: 55°F Lo: 13°C |
Wednesday... Mostly sunny. Highs in the upper 70s. South winds 5 to 10 mph. |
| Thu Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Thursday... Mostly clear. Lows in the mid 50s. Highs in the lower 80s. |
| Fri Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Friday... Mostly cloudy. Highs around 80. Lows in the upper 50s. |
Sat Hi: 75°FHi: 24°C Lo: 59°F Lo: 15°C |
Saturday... Mostly cloudy with a 40% chance of showers. Highs in the mid 70s. |
| Sun Hi: 75°FHi: 24°C Lo: 59°F Lo: 15°C |
Sunday... Mostly cloudy. A 50% chance of showers. Lows in the upper 50s. Highs in the mid 70s. |
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