| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 04-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 65°. Wind south around 8 mph, gusting to 26 mph. |
| Friday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. High 86°. UV index up to 6. Wind south around 9 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 67°. Wind south-southwest around 8 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 83°. UV index up to 6. Wind southwest around 6 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. Low 70°. Wind southwest around 4 mph, gusting to 18 mph. |
| Sunday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain very likely. Thunderstorms very likely, some possibly severe. High 75°. UV index up to 4. Wind southeast around 4 mph, gusting to 15 mph, in the morning, becoming 8 mph, gusting to 18 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday night |
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Thunderstorms very likely, some possibly severe. Low 70°. Wind south-southeast around 7 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Moderate fog in the morning, then moderate to dense fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. High 75°. UV index up to 4. Wind south around 5 mph. Chance of precipitation 70 percent. Precipitation mostly around an inch. |
| Monday night |
Moderate fog in the evening, then moderate to dense fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 69°. Wind south-southwest around 4 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Hot. High 90°. Heat index up to 98°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 74°. Wind south-southwest around 7 mph, gusting to 18 mph. |
| Wednesday |
Sunny. Light to moderate fog in the morning. Very hot. High 93°. Heat index up to 105°. UV index up to 10. Wind southwest around 8 mph, gusting to 24 mph. |
| Wednesday night |
Clear. Light to moderate fog in the evening, then moderate fog after midnight. Low 73°. Wind west-southwest around 4 mph, gusting to 17 mph. |
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