| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 25-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 69°. Wind east around 4 mph, gusting to 20 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Friday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog. Rain. Scattered thunderstorms likely. Relatively cool. High 73°. UV index up to 6. Wind south-southeast around 6 mph, gusting to 18 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation near 100 percent. Precipitation mostly between 1 and 2 inches. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely. Precipitation showery or intermittent. Low 68°. Wind west around 5 mph in the evening, becoming north after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 81°. UV index up to 5. Wind northeast around 3 mph, gusting to 20 mph, in the morning, becoming south in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 69°. Wind southeast around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain. Scattered thundershowers possible. Hot. High 92°. Heat index up to 102°. UV index up to 9. Wind south around 6 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog after midnight. Low 74°. Wind south around 5 mph, gusting to 18 mph. |
| Monday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Very hot. High 96°. Heat index up to 108°. UV index up to 9. Wind south around 7 mph, gusting to 24 mph. |
| Monday night |
Clear. Patchy light fog in the evening, then light to moderate fog after midnight. Low 76°. Wind south around 5 mph, gusting to 18 mph. |
| Tuesday |
Sunny. Light to moderate fog in the morning. Very hot. High 96°. Heat index up to 111°. UV index up to 10. Wind south around 5 mph, gusting to 22 mph. |
| Tuesday night |
Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 76°. Wind south around 4 mph, gusting to 15 mph. |
| Wednesday |
Sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. Very hot. High 96°. Heat index up to 111°. UV index up to 10. Wind south-southwest around 4 mph, gusting to 19 mph, in the morning, becoming southeast in the afternoon. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 76°. Wind south-southeast around 4 mph, gusting to 15 mph, in the evening, becoming southwest after midnight. |
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