| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 10-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Near record warmth. High 86°. UV index up to 4. Wind south-southwest around 8 mph, gusting to 29 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Tonight |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. Rain likely. Thunderstorms very likely, some severe. Breezy and unusually warm. Low 67°. Wind south-southwest around 11 mph, gusting to 28 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some severe. Breezy and mild. High 69°, but temperatures falling in the afternoon. Wind west-southwest around 12 mph, gusting to 32 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 36°. Wind northwest around 12 mph, gusting to 31 mph, in the evening, becoming 7 mph, gusting to 25 mph, after midnight. |
| Thursday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 57°. Wind west-southwest around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon. |
| Thursday night |
Partly cloudy. Breezy. Low 43°. Wind south-southwest around 11 mph, gusting to 23 mph, in the evening, becoming 15 mph, gusting to 24 mph, after midnight. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 60°. UV index up to 4. Wind west-northwest around 11 mph, gusting to 28 mph. |
| Friday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 36°. Wind north-northeast around 4 mph, gusting to 22 mph, in the evening, becoming east-northeast after midnight. |
| Saturday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 67°. UV index up to 5. Wind east around 8 mph, gusting to 22 mph, in the morning, becoming south-southeast around 11 mph, gusting to 28 mph, in the afternoon. |
| Saturday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 48°. Wind south-southeast around 10 mph, gusting to 23 mph. |
| Sunday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Breezy and mild. High 66°. Wind south-southwest around 12 mph, gusting to 27 mph, in the morning, becoming west around 15 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Windy and cold. Low 26°. Wind chill ranging from 18 to 46. Wind northwest around 16 mph, gusting to 35 mph. |
| Monday |
Partly cloudy in the morning, becoming sunny in the afternoon. Breezy and very cold. High 30°. Wind chill ranging from 12 to 19. UV index up to 6. Wind northwest around 14 mph, gusting to 30 mph. |
| Monday night |
Clear. Cold. Low 23°. Wind chill as low as 17. Wind north-northwest around 9 mph, gusting to 26 mph, in the evening, becoming 5 mph, gusting to 19 mph, after midnight. |
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