| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 01-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming partly cloudy in the afternoon. High 64°. UV index up to 6. Wind west-northwest around 6 mph, gusting to 25 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming clear after midnight. Cool. Low 42°. Wind west-southwest around 3 mph, gusting to 19 mph, in the evening, becoming northwest after midnight. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Cool. High 61°. UV index up to 5. Wind north-northwest around 8 mph, gusting to 26 mph. |
| Saturday night |
Clear. Unusually cold. Low 41°. Wind north-northwest around 4 mph, gusting to 23 mph, in the evening, becoming south-southwest after midnight. |
| Sunday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 71°. UV index up to 7. Wind south-southwest around 9 mph, gusting to 28 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 52°. Wind west-southwest around 6 mph, gusting to 22 mph. |
| Monday |
Partly cloudy. A chance of rain in the afternoon. Scattered thundershowers possible. Warm. High 78°. UV index up to 6. Wind southwest around 10 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Moderate fog. Rain likely. Scattered thunderstorms likely. Low 58°. Wind southwest around 7 mph, gusting to 19 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Tuesday |
Dense overcast. Patchy light fog. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. Cool. High 61°, but temperatures falling in the afternoon. Wind west-northwest around 6 mph, gusting to 19 mph, in the morning, becoming north-northeast around 10 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Cool. Low 47°. Wind north-northeast around 7 mph, gusting to 22 mph, in the evening, becoming 3 mph, gusting to 16 mph, after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. Cool. High 59°. Wind northeast around 3 mph, gusting to 21 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair in the evening, becoming clear after midnight. Cool. Low 44°. Wind west-northwest around 5 mph, gusting to 20 mph. |
| Thursday |
Sunny. High 64°. UV index up to 9. Wind north-northwest around 6 mph, gusting to 25 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming dense overcast after midnight. A chance of rain after midnight. Precipitation showery or intermittent. Cool. Low 48°. Wind east-southeast around 5 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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