| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 12-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 54°. Wind west-northwest around 5 mph, gusting to 23 mph, in the morning, becoming southwest around 8 mph, gusting to 24 mph, in the afternoon. |
| Tonight |
Partly cloudy. Breezy. Low 40°. Wind southwest around 11 mph, gusting to 23 mph, in the evening, becoming 15 mph, gusting to 23 mph, after midnight. |
| Friday |
Partly cloudy. Breezy. High 60°. Wind west-northwest around 13 mph, gusting to 28 mph, in the morning, becoming 10 mph, gusting to 29 mph, in the afternoon. |
| Friday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 36°. Wind northwest around 4 mph, gusting to 22 mph, in the evening, becoming east-northeast after midnight. |
| Saturday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 64°. UV index up to 4. Wind east around 9 mph, gusting to 27 mph. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 48°. Wind east-southeast around 8 mph, gusting to 23 mph, in the evening, becoming south-southeast after midnight. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. Breezy and mild. High 64°. Wind south-southeast around 13 mph, gusting to 28 mph, in the morning, becoming south-southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday night |
Cloudy in the evening, becoming dense overcast after midnight. Rain likely in the evening, then a mix of snow and rain likely after midnight. Scattered thundershowers possible. Windy and cold. Low 27°. Wind chill ranging from 19 to 53. Wind west-northwest around 18 mph, gusting to 35 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. Snow accumulation about a quarter inch. |
| Monday |
Dense overcast in the morning, becoming partly to mostly cloudy in the afternoon. A chance of snow in the morning, then a slight chance of snow in the afternoon. Windy and very cold. High 29°, but temperatures falling in the afternoon. Wind chill ranging from 10 to 18. Wind west-northwest around 17 mph, gusting to 34 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
| Monday night |
Clear. Very cold. Low 19°. Wind chill as low as 9. Wind west-northwest around 11 mph, gusting to 26 mph, in the evening, becoming 8 mph, gusting to 21 mph, after midnight. |
| Tuesday |
Partly cloudy. High 39°. Wind west-northwest around 4 mph, gusting to 23 mph. |
| Tuesday night |
Cloudy in the evening, becoming dense overcast after midnight. Snow likely. Cold. Low 30°. Wind chill ranging from 21 to 37. Wind east-southeast around 5 mph, gusting to 24 mph, in the evening, becoming 11 mph, gusting to 25 mph, after midnight. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation about half an inch. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of snow in the morning, then a slight chance of rain in the afternoon. High 44°. Wind east-southeast around 8 mph, gusting to 24 mph, in the morning, becoming northeast in the afternoon. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected. |
| Wednesday night |
Cloudy. Low 38°. Wind northeast around 4 mph, gusting to 21 mph. |
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