| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 03-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly cloudy. Patchy light fog after midnight. A chance of rain. Low 56°. Wind west-southwest around 5 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 78°. UV index up to 6. Wind southwest around 9 mph, gusting to 26 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some severe. Low 60°. Wind west-southwest around 7 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Dense overcast. Light to moderate fog in the morning. Rain likely. Thunderstorms very likely, some severe. High 65°. UV index up to 4. Wind north-northeast around 5 mph, gusting to 23 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Tuesday night |
Cloudy in the evening, becoming partly to mostly 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. Cool. Low 50°. Wind north-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Mostly cloudy. Patchy light fog in the morning. A slight chance of rain. Cool. High 61°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. A slight chance of rain. Cool. Low 46°. Wind north around 4 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Sunny in the morning, becoming partly cloudy in the afternoon. Cool. High 62°. UV index up to 5. Wind west-northwest around 7 mph, gusting to 26 mph. |
| Thursday night |
Partly cloudy. Cool. Low 46°. Wind southwest around 5 mph, gusting to 19 mph. |
| Friday |
Mostly cloudy. A chance of rain. High 66°. UV index up to 4. Wind southwest around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. A chance of rain. Cool. Low 47°. Wind west-northwest around 3 mph, gusting to 18 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 72°. UV index up to 8. Wind east-southeast around 6 mph, gusting to 24 mph. |
| Saturday night |
Cloudy. Low 56°. Wind east-southeast around 4 mph, gusting to 21 mph, in the evening, becoming northeast after midnight. |
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