| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 14-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 66°. UV index up to 5. Wind east-southeast around 6 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 28 mph, in the afternoon. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 48°. Wind southeast around 9 mph, gusting to 23 mph, in the evening, becoming south after midnight. |
| 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. Thunderstorms very likely, some severe. Breezy and mild. High 68°. Wind south around 15 mph, gusting to 31 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. A chance of rain in the evening, then a slight chance of a mix of rain and snow after midnight. Windy and cold. Low 26°. Wind chill ranging from 17 to 49. Wind west-northwest around 18 mph, gusting to 35 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Little or no snow accumulation expected. |
| Monday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of snow. Windy and very cold. High 28°, but temperatures falling in the afternoon. Wind chill ranging from 10 to 17. Wind west-northwest around 16 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 |
Partly cloudy in the evening, becoming clear after midnight. Very cold. Low 15°. Wind chill ranging from 4 to 10. Wind west-northwest around 10 mph, gusting to 26 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 42°. Wind west-northwest around 5 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon. |
| Tuesday night |
Mostly cloudy to cloudy. A slight chance of a mix of snow and sleet in the evening, then a slight chance of a mix of sleet and rain after midnight. Low 32°. Wind chill ranging from 24 to 37. Wind south-southeast around 7 mph, gusting to 23 mph, in the evening, becoming 11 mph, gusting to 21 mph, after midnight. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected. |
| Wednesday |
Partly cloudy. Mild. High 66°. Wind south around 10 mph, gusting to 27 mph, in the morning, becoming west-southwest in the afternoon. |
| Wednesday night |
Clear. Low 39°. Wind west-southwest around 3 mph, gusting to 18 mph. |
| Thursday |
Mostly sunny. Unusually warm. High 73°. UV index up to 6. Wind west-southwest around 4 mph, gusting to 23 mph, in the morning, becoming northwest in the afternoon. |
| Thursday night |
Partly cloudy in the evening, becoming clear after midnight. Low 40°. Wind east-southeast around 3 mph in the evening, becoming south after midnight. |
| Friday |
Sunny. Unusually warm. High 76°. UV index up to 6. Wind south-southwest near calm in the morning, becoming west around 5 mph, gusting to 23 mph, in the afternoon. |
| Friday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 45°. Wind northwest around 4 mph, gusting to 16 mph. |
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