| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 19-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 83°. UV index up to 7. Wind west-northwest around 3 mph, gusting to 23 mph, in the morning, becoming north in the afternoon. |
| Tonight |
Partly cloudy. Relatively cool. Low 61°. Wind east around 2 mph, gusting to 16 mph, in the evening, becoming south after midnight. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 88°. UV index up to 10. Wind west-southwest around 3 mph, gusting to 21 mph, in the morning, becoming south in the afternoon. |
| Saturday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Relatively cool. Low 64°. Wind east around 5 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. Rain very likely. Scattered thunderstorms likely. High 82°. UV index up to 6. Wind south-southeast around 9 mph, gusting to 24 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 69°. Wind west-northwest around 7 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 79°. UV index up to 7. Wind north around 7 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy to cloudy. Relatively cool. Low 64°. Wind north-northeast around 4 mph, gusting to 23 mph. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 79°. UV index up to 8. Wind north-northeast around 4 mph, gusting to 22 mph. |
| Tuesday night |
Partly to mostly cloudy. Relatively cool. Low 62°. Wind east-northeast around 3 mph, gusting to 18 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 82°. UV index up to 9. Wind west-southwest around 6 mph, gusting to 24 mph, in the morning, becoming northwest in the afternoon. |
| Wednesday night |
Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Relatively cool. Low 61°. Wind north-northwest around 3 mph, gusting to 20 mph, in the evening, becoming east-southeast after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the afternoon. Scattered thunderstorms likely. High 84°. UV index up to 8. Wind southeast around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Dense overcast in the evening, becoming mostly 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. Thunderstorms very likely, some possibly severe. Low 68°. Wind east around 8 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
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