| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 26-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. Warm. High 77°. UV index up to 6. Wind east-southeast around 5 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon. |
| Tonight |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain after midnight. Low 55°. Wind east-southeast around 8 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some severe. Breezy and warm. High 79°. UV index up to 5. Wind south-southeast around 11 mph, gusting to 27 mph, in the morning, becoming 16 mph, gusting to 30 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Monday night |
Fair in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 55°. Wind southwest around 11 mph, gusting to 26 mph, in the evening, becoming west-northwest around 7 mph, gusting to 17 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly sunny. Patchy light fog in the morning. A slight chance of rain in the afternoon. Warm. High 77°. UV index up to 8. Wind northwest around 5 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 53°. Wind north-northwest around 7 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 69°. UV index up to 6. Wind north-northwest around 9 mph, gusting to 27 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Low 46°. Wind north-northwest around 4 mph, gusting to 23 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 69°. UV index up to 7. Wind southwest around 2 mph, gusting to 30 mph, in the morning, becoming northwest around 6 mph, gusting to 27 mph, in the afternoon. |
| Thursday night |
Partly to mostly cloudy. Low 50°. Wind north around 4 mph, gusting to 21 mph, in the evening, becoming east-southeast after midnight. |
| Friday |
Mostly cloudy. A chance of rain. High 65°. UV index up to 5. Wind west around 2 mph, gusting to 24 mph, in the morning, becoming north-northwest around 6 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly to mostly cloudy in the evening, becoming clear after midnight. Cool. Low 43°. Wind north-northeast around 8 mph, gusting to 24 mph. |
| Saturday |
Sunny. High 63°. UV index up to 9. Wind north-northeast around 9 mph, gusting to 27 mph. |
| Saturday night |
Clear. Cool. Low 41°. Wind north around 4 mph, gusting to 23 mph. |
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