| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 29-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 65°. UV index up to 5. Wind northwest around 9 mph, gusting to 28 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Tonight |
Partly to mostly cloudy in the evening, becoming fair after midnight. Cool. Low 44°. Wind northwest around 8 mph, gusting to 26 mph, in the evening, becoming 3 mph, gusting to 16 mph, after midnight. |
| Thursday |
Mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 66°. UV index up to 6. Wind west-southwest around 2 mph, gusting to 27 mph, in the morning, becoming 5 mph, gusting to 24 mph, in the afternoon. |
| Thursday night |
Cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Cool. Low 45°. Wind west-northwest around 5 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Cool. High 60°. UV index up to 6. Wind north around 9 mph, gusting to 27 mph. |
| Friday night |
Partly cloudy in the evening, becoming fair after midnight. Cool. Low 40°. Wind north around 4 mph, gusting to 23 mph. |
| Saturday |
Partly to mostly sunny. Cool. High 59°. UV index up to 6. Wind north around 5 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Saturday night |
Clear. Unusually cold. Low 40°. Wind northwest around 4 mph, gusting to 24 mph, in the evening, becoming west-southwest after midnight. |
| Sunday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 69°. UV index up to 7. Wind west-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 13 mph, gusting to 30 mph, in the afternoon. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Rain likely. Scattered thundershowers possible. Cool. Low 48°. Wind west-southwest around 8 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday |
Partly cloudy. Patchy light fog in the morning. Breezy. High 74°. UV index up to 6. Wind west-southwest around 9 mph, gusting to 29 mph, in the morning, becoming 13 mph, gusting to 31 mph, in the afternoon. |
| Monday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 55°. Wind west-southwest around 10 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. High 69°. Wind west-southwest around 7 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Thunderstorms very likely, some possibly severe. Low 59°. Wind south-southeast around 5 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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