| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 27-Feb-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear in the evening, becoming fair after midnight. Low 33°. Wind west around 7 mph, gusting to 24 mph, in the evening, becoming northwest after midnight. |
| Saturday |
Partly cloudy. Mild. High 63°. Wind east-northeast around 5 mph, gusting to 25 mph, in the morning, becoming southeast in the afternoon. |
| Saturday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Low 30°. Wind northeast around 7 mph, gusting to 21 mph. |
| Sunday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 48°. Wind northeast around 7 mph, gusting to 26 mph. |
| Sunday night |
Cloudy in the evening, becoming dense overcast after midnight. A chance of a mix of rain, sleet, and snow in the evening, then a chance of a mix of sleet, freezing rain, rain, and snow after midnight. Low 30°. Wind chill ranging from 24 to 39. Wind northeast around 7 mph, gusting to 23 mph. Chance of precipitation 60 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. |
| Monday |
Dense overcast in the morning, becoming cloudy in the afternoon. A slight chance of a mix of rain and freezing rain in the morning, then a slight chance of rain in the afternoon. High 41°. Wind east-northeast around 8 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No ice (on ground) accumulation expected. Little if any freezing rain accumulation. |
| Monday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Rain likely. Low 34°. Wind east around 6 mph, gusting to 15 mph, in the evening, becoming southeast after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Dense overcast. Patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. Mild. High 61°. Wind south around 8 mph in the morning, becoming west-southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tuesday night |
Cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Low 40°. Wind north-northeast around 6 mph, gusting to 15 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. High 55°. Wind east-northeast around 6 mph, gusting to 17 mph, in the morning, becoming southeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog. Low 43°. Wind southwest around 4 mph, gusting to 16 mph. |
| Thursday |
Partly cloudy. Mild. High 66°. UV index up to 5. Wind west-southwest around 5 mph, gusting to 25 mph. |
| Thursday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Relatively mild. Low 52°. Wind south-southeast around 5 mph, gusting to 16 mph, in the evening, becoming 9 mph, gusting to 18 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
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