| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 12-Aug-2025 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 87°. UV index up to 7. Wind south around 4 mph, gusting to 21 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Moderate fog. A slight chance of rain. Low 70°. Wind south around 3 mph in the evening, becoming west after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. High 84°. UV index up to 7. Wind north-northwest around 4 mph, gusting to 21 mph. |
| Wednesday night |
Fair in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 67°. Wind north around 3 mph, gusting to 17 mph. |
| Thursday |
Sunny. Light to moderate fog in the morning. High 83°. UV index up to 8. Wind northeast around 2 mph, gusting to 18 mph. |
| Thursday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 68°. Wind east-northeast around 4 mph in the evening, becoming southeast after midnight. |
| Friday |
Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 88°. Heat index up to 93°. UV index up to 8. Wind south-southeast around 4 mph in the morning, becoming south-southwest in the afternoon. |
| Friday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 72°. Wind east-southeast around 4 mph in the evening, becoming south after midnight. |
| Saturday |
Sunny. Patchy light fog in the morning. Hot. High 91°. Heat index up to 99°. UV index up to 8. Wind south-southwest around 4 mph. |
| Saturday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 73°. Wind south-southeast around 4 mph. |
| Sunday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 92°. Heat index up to 101°. UV index up to 8. Wind south-southwest around 3 mph. |
| Sunday night |
Partly cloudy. Moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 76°. Wind east around 3 mph in the evening, becoming southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Partly to mostly sunny. Patchy light fog in the morning. A slight chance of rain. High 88°. Heat index up to 97°. UV index up to 8. Wind west-northwest around 3 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 74°. Wind north-northeast around 3 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
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