| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 08-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny. Mild. High 63°. UV index up to 4. Wind southwest around 5 mph, gusting to 19 mph, in the morning, becoming 8 mph, gusting to 23 mph, in the afternoon. |
| Tonight |
Fair. Low 40°. Wind southwest around 7 mph, gusting to 18 mph. |
| Monday |
Mostly sunny. Unusually warm. High 74°. UV index up to 5. Wind southwest around 9 mph, gusting to 26 mph. |
| Monday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Relatively mild. Low 49°. Wind south-southwest around 7 mph, gusting to 18 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Unusually warm. High 77°. Wind south-southwest around 7 mph, gusting to 22 mph, in the morning, becoming 11 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. Rain very likely. Precipitation showery or intermittent. Unusually warm. Low 63°. Wind south-southwest around 8 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly around 2 inches. |
| Wednesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Light to moderate fog. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Mild. High 64°, but temperatures falling in the afternoon. Wind west-northwest around 8 mph, gusting to 24 mph, in the morning, becoming 13 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Wednesday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Breezy. Low 36°. Wind north-northwest around 14 mph, gusting to 30 mph, in the evening, becoming 10 mph, gusting to 28 mph, after midnight. |
| Thursday |
Sunny. Patchy light fog in the morning. High 50°. Wind west-northwest around 7 mph, gusting to 23 mph, in the morning, becoming southwest in the afternoon. |
| Thursday night |
Partly cloudy. Breezy. Low 41°. Wind southwest around 12 mph, gusting to 21 mph, in the evening, becoming 15 mph, gusting to 22 mph, after midnight. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 58°. UV index up to 4. Wind west-southwest around 10 mph, gusting to 23 mph, in the morning, becoming northwest in the afternoon. |
| Friday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 37°. Wind north around 8 mph, gusting to 19 mph. |
| Saturday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 50°. Wind northeast around 9 mph, gusting to 26 mph, in the morning, becoming east in the afternoon. |
| Saturday night |
Dense overcast in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 38°. Wind east around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
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