| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 25-Mar-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Mild. Low 57°. Wind southwest around 9 mph, gusting to 27 mph. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Breezy with near record warmth. High 89°. UV index up to 7. Wind southwest around 11 mph, gusting to 30 mph. |
| Thursday night |
Partly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 51°. Wind southwest around 7 mph, gusting to 21 mph, in the evening, becoming north-northeast around 12 mph, gusting to 28 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Breezy. High 60°. UV index up to 7. Wind north-northeast around 12 mph, gusting to 31 mph. |
| Friday night |
Fair in the evening, becoming clear after midnight. Low 37°. Wind north around 7 mph, gusting to 27 mph. |
| Saturday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 61°. UV index up to 6. Wind east around 4 mph, gusting to 26 mph, in the morning, becoming southeast around 7 mph, gusting to 26 mph, in the afternoon. |
| Saturday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 42°. Wind south-southeast around 7 mph, gusting to 23 mph. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Mild. High 72°. UV index up to 6. Wind south-southeast around 8 mph, gusting to 26 mph. |
| Sunday night |
Partly cloudy. Low 46°. Wind south around 10 mph, gusting to 22 mph. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually hot. High 83°. UV index up to 5. Wind south-southwest around 10 mph, gusting to 26 mph. |
| Monday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Mild. Low 58°. Wind south-southwest around 8 mph, gusting to 18 mph. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Unusually warm. High 77°. Wind south-southwest around 10 mph, gusting to 25 mph. |
| Tuesday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Breezy and mild. Low 62°. Wind south-southwest around 12 mph, gusting to 21 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.