| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 13-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Breezy. High 60°. Wind west around 12 mph, gusting to 30 mph. |
| Tonight |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 37°. Wind northwest around 4 mph, gusting to 23 mph, in the evening, becoming northeast after midnight. |
| Saturday |
Partly cloudy. Mild. High 64°. UV index up to 4. Wind east-southeast around 7 mph, gusting to 25 mph, in the morning, becoming 10 mph, gusting to 28 mph, in the afternoon. |
| Saturday night |
Partly to mostly cloudy. Low 48°. Wind south-southeast around 9 mph, gusting to 24 mph. |
| Sunday |
Mostly cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. Breezy and mild. High 67°. Wind south around 14 mph, gusting to 28 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday night |
Dense overcast in the evening, becoming cloudy after midnight. Rain likely in the evening, then a slight chance of a mix of rain and snow after midnight. Windy and cold. Low 28°. Wind chill ranging from 21 to 48. Wind west around 17 mph, gusting to 35 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly between a quarter and half an inch. No snow accumulation expected. |
| Monday |
Dense overcast in the morning, becoming mostly cloudy to 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 30°, but temperatures falling in the afternoon. Wind chill ranging from 10 to 20. Wind west around 17 mph, gusting to 34 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected. |
| Monday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Very cold. Low 18°. Wind chill as low as 8. Wind west around 10 mph, gusting to 26 mph. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 41°. Wind northwest around 5 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon. |
| Tuesday night |
Cloudy. Low 33°. Wind chill ranging from 26 to 38. Wind south-southeast around 6 mph, gusting to 23 mph, in the evening, becoming 10 mph, gusting to 21 mph, after midnight. |
| Wednesday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Mild. High 65°. UV index up to 4. Wind south-southeast around 9 mph, gusting to 25 mph, in the morning, becoming southwest in the afternoon. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 43°. Wind northwest around 5 mph, gusting to 21 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Mild. High 67°. UV index up to 5. Wind northwest around 3 mph, gusting to 23 mph, in the morning, becoming west-southwest in the afternoon. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 44°. Wind south around 4 mph, gusting to 15 mph. |
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