| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 24-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy. Moderate fog. Rain likely. Precipitation showery or intermittent. Low 71°. Wind southwest around 4 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Moderate fog in the morning. Rain likely. Scattered thunderstorms likely. High 86°. UV index up to 6. Wind west-southwest around 3 mph, gusting to 21 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Scattered thunderstorms likely. Low 72°. Wind southeast around 3 mph. Chance of precipitation 90 percent. Precipitation mostly around half an inch. |
| Friday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog in the morning, then moderate fog in the afternoon. Rain. Scattered thunderstorms likely. Relatively cool. High 76°. UV index up to 4. Wind south around 5 mph, gusting to 17 mph. Chance of precipitation near 100 percent. Precipitation mostly between 1 and 2 inches. |
| Friday night |
Moderate fog. Rain. Scattered thundershowers possible. Low 70°. Wind south around 4 mph. Chance of precipitation 90 percent. Precipitation mostly around an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. 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. Scattered thundershowers possible. High 82°. UV index up to 8. Wind south-southwest around 5 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. Rain very likely. Scattered thunderstorms likely. Low 73°. Wind southeast around 5 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Moderate to dense fog in the morning. Hot. High 92°. Heat index up to 103°. UV index up to 10. Wind south-southwest around 7 mph, gusting to 23 mph. |
| Sunday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Low 75°. Wind south-southwest around 5 mph, gusting to 18 mph. |
| Monday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. Hot. High 95°. Heat index up to 108°. UV index up to 10. Wind south-southwest around 6 mph, gusting to 23 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 75°. Wind south around 5 mph, gusting to 17 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Very hot. High 96°. Heat index up to 109°. UV index up to 8. Wind southwest around 4 mph, gusting to 20 mph. |
| Tuesday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 75°. Wind southwest around 2 mph. |
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