| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 03-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Dense overcast. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 51°. Wind east-southeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely. Low 40°. Wind north-northeast around 5 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Dense overcast. Patchy light fog in the morning. Rain likely. High 54°. Wind north-northeast around 3 mph in the morning, becoming east-southeast in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Cloudy. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Low 47°. Wind east around 4 mph in the evening, becoming west-southwest after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Thursday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. Mild. High 66°. UV index up to 4. Wind west around 5 mph, gusting to 23 mph. |
| Thursday night |
Mostly cloudy. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Relatively mild. Low 49°. Wind east-southeast around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. Exceptionally hot. High 79°. UV index up to 5. Wind south-southeast around 8 mph, gusting to 20 mph, in the morning, becoming 13 mph, gusting to 28 mph, in the afternoon. |
| Friday night |
Partly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Unusually mild. Low 61°. Wind south around 10 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain. Mild. High 68°. UV index up to 5. Wind west around 10 mph, gusting to 29 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 42°. Wind west around 4 mph, gusting to 25 mph. |
| Sunday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Mild. High 66°. UV index up to 4. Wind west-southwest around 5 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 23 mph, in the afternoon. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 41°. Wind west-southwest around 6 mph, gusting to 16 mph. |
| Monday |
Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy and unusually warm. High 74°. UV index up to 5. Wind southwest around 8 mph, gusting to 17 mph, in the morning, becoming 14 mph, gusting to 27 mph, in the afternoon. |
| Monday night |
Mostly clear. Patchy light fog. Relatively mild. Low 48°. Wind southwest around 9 mph, gusting to 21 mph. |
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