| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 06-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 65°. UV index up to 6. Wind north-northwest around 7 mph, gusting to 25 mph. |
| Tonight |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 42°. Wind north around 6 mph, gusting to 22 mph. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. High 55°. Wind east-northeast around 7 mph, gusting to 25 mph. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Cold. Low 38°. Wind east-southeast around 8 mph, gusting to 24 mph. |
| Wednesday |
Partly cloudy. High 70°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 28 mph. |
| Wednesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 46°. Wind south around 9 mph, gusting to 22 mph. |
| Thursday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 78°. UV index up to 5. Wind south around 9 mph, gusting to 27 mph. |
| Thursday night |
Partly cloudy. A slight chance of rain after midnight. Low 51°. Wind south around 7 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. Mild. High 72°. UV index up to 5. Wind south-southwest around 7 mph, gusting to 24 mph, in the morning, becoming west in the afternoon. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 51°. Wind north-northeast around 4 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Saturday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 70°. UV index up to 6. Wind east around 5 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 52°. Wind south-southeast around 6 mph, gusting to 18 mph. |
| Sunday |
Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. Breezy. High 69°. Wind south-southwest around 11 mph, gusting to 20 mph, in the morning, becoming 15 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Breezy and mild. Low 61°. Wind south-southwest around 11 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
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