| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 02-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair. Unusually cold. Low 41°. Wind north-northeast around 3 mph, gusting to 24 mph, in the evening, becoming south-southeast after midnight. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 71°. UV index up to 6. Wind south-southwest around 10 mph, gusting to 29 mph. |
| Sunday night |
Partly to mostly cloudy. Light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 51°. Wind west-southwest around 4 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Partly cloudy in the morning, becoming mostly cloudy 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. Scattered thunderstorms likely, some possibly severe. High 76°. UV index up to 5. Wind southwest around 10 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain very likely. Scattered thunderstorms likely. Low 58°. Wind southwest around 7 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Tuesday |
Dense overcast. Patchy light fog in the morning, then light to moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. Cool. High 60°, but temperatures falling in the afternoon. Wind north-northwest around 8 mph, gusting to 24 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Tuesday night |
Mostly cloudy. 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 48°. Wind north-northwest around 6 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Mostly cloudy. Cool. High 61°. UV index up to 6. Wind north-northeast around 5 mph, gusting to 23 mph. |
| Wednesday night |
Cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Cool. Low 44°. Wind north around 5 mph, gusting to 23 mph, in the evening, becoming northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Cool. High 59°. UV index up to 6. Wind west-northwest around 4 mph, gusting to 23 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Mostly clear in the evening, becoming fair after midnight. Cool. Low 43°. Wind west around 5 mph, gusting to 21 mph, in the evening, becoming southwest after midnight. |
| Friday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 65°. UV index up to 5. Wind west-southwest around 8 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 25 mph, in the afternoon. |
| Friday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Cool. Low 45°. Wind north-northwest around 9 mph, gusting to 23 mph, in the evening, becoming 5 mph after midnight. |
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