| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 25-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming mostly sunny in the afternoon. Warm. High 77°. UV index up to 7. Wind northeast around 5 mph, gusting to 24 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 51°. Wind east-northeast around 5 mph, gusting to 20 mph. |
| Sunday |
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 6 mph, gusting to 23 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Low 54°. Wind east-southeast around 7 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Breezy and warm. High 83°. UV index up to 7. Wind south-southeast around 12 mph, gusting to 30 mph, in the morning, becoming 17 mph, gusting to 33 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog. A chance of rain. Scattered thunderstorms likely. Low 58°. Wind west-southwest around 9 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain in the afternoon. High 76°. UV index up to 7. Wind northwest around 5 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 53°. Wind north around 7 mph, gusting to 16 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 68°. UV index up to 6. Wind north around 9 mph, gusting to 27 mph. |
| Wednesday night |
Fair in the evening, becoming clear after midnight. Low 47°. Wind north around 4 mph, gusting to 24 mph, in the evening, becoming west-northwest after midnight. |
| Thursday |
Partly cloudy. A slight chance of rain in the afternoon. High 67°. UV index up to 6. Wind west-southwest around 7 mph, gusting to 27 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy. Cool. Low 46°. Wind north-northwest around 8 mph, gusting to 21 mph. |
| Friday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 60°. UV index up to 6. Wind northeast around 8 mph, gusting to 26 mph. |
| Friday night |
Partly cloudy in the evening, becoming clear after midnight. Cool. Low 43°. Wind north around 6 mph, gusting to 25 mph. |
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