| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 06-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy. Patchy light fog after midnight. Low 74°. Wind south-southwest around 4 mph, gusting to 22 mph. |
| Sunday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. A slight chance of rain. Scattered thunderstorms likely. High 86°. UV index up to 8. Wind south-southeast around 5 mph, gusting to 20 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Cloudy. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Thunderstorms very likely, some possibly severe. Low 73°. Wind south around 6 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. High 85°. Heat index up to 92°. UV index up to 7. Wind south-southeast around 7 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Monday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Thunderstorms very likely, some possibly severe. Low 74°. Wind south-southwest around 4 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Sunny. Moderate fog in the morning. Hot. High 91°. Heat index up to 101°. UV index up to 10. Wind south-southwest around 7 mph, gusting to 25 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 75°. Wind south-southwest around 6 mph, gusting to 21 mph. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Hot. High 93°. Heat index up to 103°. UV index up to 8. Wind south-southwest around 9 mph, gusting to 26 mph. |
| Wednesday night |
Mostly clear in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Warm. Low 75°. Wind south-southwest around 8 mph, gusting to 22 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 93°. Heat index up to 103°. UV index up to 10. Wind south-southwest around 9 mph, gusting to 27 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Scattered thunderstorms likely. Low 72°. Wind south-southwest around 6 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly to mostly cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 83°. UV index up to 8. Wind northwest around 8 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Friday night |
Partly to mostly cloudy. Patchy light fog after midnight. Low 66°. Wind north around 6 mph, gusting to 24 mph. |
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