| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 03-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair in the evening, becoming partly cloudy after midnight. Relatively cool. Low 59°. Wind east around 4 mph, gusting to 24 mph, in the evening, becoming south after midnight. |
| Thursday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 84°. UV index up to 7. Wind south around 6 mph, gusting to 24 mph. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 64°. Wind south around 7 mph, gusting to 21 mph. |
| Friday |
Mostly cloudy. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. High 86°. UV index up to 6. Wind south-southwest around 9 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly to mostly cloudy. Moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 68°. Wind southwest around 8 mph, gusting to 23 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Moderate to dense fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Hot. High 86°. UV index up to 6. Wind southwest around 6 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly cloudy. Patchy light fog after midnight. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Low 71°. Wind southwest around 3 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 83°. UV index up to 8. Wind southeast around 2 mph, gusting to 16 mph, in the morning, becoming 5 mph, gusting to 19 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely. Thunderstorms very likely, some severe. Low 73°. Wind south-southeast around 6 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday |
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. Thunderstorms very likely, some severe. High 76°. UV index up to 4. Wind south-southeast around 7 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Monday night |
Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 71°. Wind south-southeast around 6 mph, gusting to 15 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Moderate fog in the morning, then light to moderate fog in the afternoon. Rain likely. Thunderstorms very likely, some possibly severe. High 78°. Wind south around 7 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming clear after midnight. Moderate fog. Low 70°. Wind south around 7 mph. |
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