| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 25-Feb-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Low 33°. Wind east around 4 mph, gusting to 17 mph, in the evening, becoming northeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Relatively mild. High 58°. Wind east-northeast around 3 mph, gusting to 25 mph, in the morning, becoming south-southwest in the afternoon. |
| Thursday night |
Clear. Low 30°. Wind southwest around 3 mph. |
| Friday |
Sunny. Unusually mild. High 67°. Wind southwest around 6 mph, gusting to 18 mph, in the morning, becoming 10 mph, gusting to 26 mph, in the afternoon. |
| Friday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Low 31°. Wind southwest around 5 mph, gusting to 18 mph, in the evening, becoming north after midnight. |
| Saturday |
Partly cloudy. Relatively mild. High 59°. Wind east-northeast around 5 mph, gusting to 24 mph. |
| Saturday night |
Partly cloudy. Low 29°. Wind chill ranging from 24 to 52. Wind north-northeast around 9 mph, gusting to 23 mph. |
| Sunday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of a mix of sleet, freezing rain, rain, and snow in the morning, then a chance of a mix of snow, rain, and sleet in the afternoon. High 40°. Wind chill ranging from 22 to 31. Wind northeast around 9 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Little or no snow or ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Sunday night |
Dense overcast in the evening, becoming cloudy after midnight. A mix of sleet, snow, and rain likely in the evening, then a chance of a mix of sleet, freezing rain, and snow after midnight. Low 27°. Wind chill ranging from 20 to 26. Wind east-northeast around 9 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. Snow or ice (on ground) accumulation about an inch. Little if any freezing rain accumulation. |
| Monday |
Mostly cloudy. A chance of a mix of freezing rain and sleet in the morning, then a chance of rain in the afternoon. High 43°. Wind east-northeast around 7 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. No ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Monday night |
Mostly cloudy. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 31°. Wind east-northeast around 4 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. High 47°. Wind southeast around 5 mph, gusting to 18 mph, in the morning, becoming south-southwest in the afternoon. |
| Tuesday night |
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 35°. Wind west around 3 mph, gusting to 18 mph, in the evening, becoming northwest after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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