| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 23-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 83°. UV index up to 8. Wind east-northeast around 3 mph, gusting to 22 mph. |
| Tonight |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Relatively cool. Low 61°. Wind east around 4 mph, gusting to 19 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 86°. UV index up to 8. Wind south around 6 mph, gusting to 26 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Relatively cool. Low 65°. Wind southwest around 4 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. A slight chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. High 81°. UV index up to 5. Wind southwest around 4 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Thursday night |
Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Thunderstorms very likely, some severe. Low 69°. Wind east-northeast around 4 mph, gusting to 16 mph. Chance of precipitation 90 percent. Precipitation mostly around an inch. |
| Friday |
Cloudy. Moderate fog in the morning, then light to moderate fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Relatively cool. High 76°. Wind east-southeast around 5 mph, gusting to 17 mph, in the morning, becoming south in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Friday night |
Mostly cloudy. Light to moderate fog. Rain likely. Thunderstorms very likely, some possibly severe. Low 70°. Wind south around 2 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some severe. High 87°. Heat index up to 92°. UV index up to 9. Wind south around 4 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some severe. Low 74°. Wind south-southeast around 5 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Sunny. Moderate fog in the morning. Hot. High 93°. Heat index up to 104°. UV index up to 10. Wind south around 8 mph, gusting to 25 mph. |
| Sunday night |
Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 74°. Wind south around 5 mph, gusting to 20 mph. |
| Monday |
Sunny. Moderate fog in the morning. Hot. High 93°. Heat index up to 105°. UV index up to 10. Wind south-southwest around 6 mph, gusting to 20 mph. |
| Monday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 74°. Wind southeast around 3 mph in the evening, becoming south-southwest after midnight. |
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