| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 13-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 70°. Wind southwest around 5 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Breezy. High 78°. UV index up to 9. Wind north-northwest around 11 mph, gusting to 28 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 59°. Wind north-northwest around 6 mph, gusting to 26 mph, in the evening, becoming 3 mph after midnight. |
| Monday |
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 79°. UV index up to 7. Wind west around 3 mph, gusting to 21 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog after midnight. Relatively cool. Low 58°. Wind south-southwest around 5 mph, gusting to 18 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 81°. UV index up to 8. Wind southwest around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday night |
Fair to partly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. Relatively cool. Low 62°. Wind west around 7 mph, gusting to 20 mph, in the evening, becoming southwest around 4 mph after midnight. |
| Wednesday |
Partly 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. Hot. High 88°. Heat index up to 92°. UV index up to 9. Wind south around 7 mph, gusting to 24 mph, in the morning, becoming 13 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Scattered thundershowers possible. Breezy. Low 71°. Wind southwest around 13 mph, gusting to 26 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Thursday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. High 81°. UV index up to 7. Wind west around 8 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday night |
Mostly clear. Light to moderate fog in the evening, then moderate fog after midnight. A slight chance of rain. Low 65°. Wind west-northwest around 4 mph, gusting to 20 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Sunny in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. High 80°. UV index up to 10. Wind north-northwest around 5 mph, gusting to 23 mph. |
| Friday night |
Partly to mostly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Relatively cool. Low 63°. Wind northeast around 3 mph, gusting to 20 mph, in the evening, becoming southeast after midnight. |
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