| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 19-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog. A chance of rain in the evening, then rain likely after midnight. Thunderstorms very likely, some possibly severe. Low 60°. Wind northwest around 7 mph, gusting to 22 mph, in the evening, becoming north after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Precipitation showery or intermittent. High 69°. UV index up to 6. Wind north around 8 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Cool. Low 53°. Wind north around 6 mph, gusting to 24 mph, in the evening, becoming east-northeast after midnight. |
| Thursday |
Mostly cloudy to cloudy. High 69°. UV index up to 7. Wind east-northeast around 7 mph, gusting to 25 mph. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Cool. Low 50°. Wind east-northeast around 7 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Dense overcast. Rain likely in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Cool. High 62°. Wind east-northeast around 6 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Partly to mostly cloudy. Patchy light fog after midnight. A slight chance of rain. Precipitation showery or intermittent. Relatively cool. Low 55°. Wind east around 4 mph in the evening, becoming south after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy to cloudy. A chance of rain. Scattered thunderstorms likely. High 75°. UV index up to 5. Wind west around 5 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 59°. Wind west-southwest around 3 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Cloudy. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 74°. Wind south around 4 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. Low 62°. Wind east-northeast around 4 mph, gusting to 22 mph. |
| Monday |
Dense overcast. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 69°. Wind east around 5 mph, gusting to 16 mph, in the morning, becoming 8 mph, gusting to 20 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Dense overcast. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 65°. Wind east-southeast around 11 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
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