| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 24-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Relatively cool. High 78°. UV index up to 4. Wind southeast around 3 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tonight |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Precipitation showery or intermittent. Relatively cool. Low 67°. Wind southeast around 4 mph. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Saturday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 83°. UV index up to 6. Wind south-southeast around 3 mph, gusting to 15 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Saturday night |
Fair to partly 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. Low 71°. Wind east around 2 mph in the evening, becoming south-southeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly sunny. Patchy light fog in the morning. Hot. High 93°. Heat index up to 101°. UV index up to 8. Wind south-southwest around 3 mph, gusting to 22 mph, in the morning, becoming southeast in the afternoon. |
| Sunday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 73°. Wind south-southeast around 4 mph, gusting to 16 mph. |
| Monday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 95°. Heat index up to 105°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 21 mph. |
| Monday night |
Clear. Low 74°. Wind west around 4 mph. |
| Tuesday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 95°. Heat index up to 104°. UV index up to 8. Wind north-northwest around 4 mph, gusting to 21 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 72°. Wind northeast around 3 mph, gusting to 16 mph, in the evening, becoming east after midnight. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 92°. Heat index up to 98°. UV index up to 8. Wind east around 4 mph, gusting to 22 mph. |
| Wednesday night |
Clear. Patchy light fog after midnight. Low 70°. Wind east around 4 mph, gusting to 17 mph. |
| Thursday |
Sunny. Patchy light fog in the morning. High 90°. Heat index up to 96°. UV index up to 9. Wind east-southeast around 7 mph, gusting to 24 mph. |
| Thursday night |
Partly to mostly cloudy. Patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 71°. Wind east-southeast around 6 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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