| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 02-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy. High 47°. Wind east-southeast around 7 mph, gusting to 20 mph. |
| Tonight |
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 35°. Wind east-southeast around 4 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 48°. Wind east around 4 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tuesday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 39°. Wind north-northeast around 5 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Dense overcast. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 52°. Wind east-northeast around 3 mph in the morning, becoming southeast in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Wednesday night |
Dense overcast. Patchy light fog. Rain likely. Relatively mild. Low 47°, but temperatures rising after midnight. Wind east-southeast around 3 mph in the evening, becoming south after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a slight chance of rain in the afternoon. Mild. High 66°. Wind southwest around 3 mph in the morning, becoming 9 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Relatively mild. Low 49°. Wind southwest around 3 mph, gusting to 16 mph, in the evening, becoming south-southeast after midnight. |
| Friday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Unusually warm. High 75°. UV index up to 5. Wind south around 6 mph, gusting to 17 mph, in the morning, becoming 12 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Relatively mild. Low 55°. Wind south-southwest around 8 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Mild. High 62°. Wind southwest around 6 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday night |
Dense overcast. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Relatively mild. Low 52°. Wind west-southwest around 5 mph, gusting to 15 mph, in the evening, becoming northwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches. |
| Sunday |
Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. A chance of rain. High 55°. Wind north-northwest around 3 mph in the morning, becoming west in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Cloudy. Patchy light fog. Relatively mild. Low 51°. Wind south-southwest around 4 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.