| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 31-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate to dense fog after midnight. A chance of rain. Thunderstorms very likely, some possibly severe. Low 65°. Wind east around 5 mph, gusting to 20 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. High 81°. UV index up to 6. Wind northeast around 5 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 62°. Wind northeast around 5 mph, gusting to 20 mph. |
| Tuesday |
Partly to mostly sunny. Patchy light fog in the morning. High 81°. UV index up to 8. Wind northeast around 8 mph, gusting to 26 mph. |
| Tuesday night |
Mostly clear in the evening, becoming clear after midnight. Relatively cool. Low 57°. Wind east-northeast around 5 mph, gusting to 23 mph. |
| Wednesday |
Partly cloudy. High 81°. UV index up to 7. Wind east around 6 mph, gusting to 25 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 58°. Wind east around 4 mph, gusting to 21 mph, in the evening, becoming south-southeast after midnight. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Hot. High 86°. UV index up to 8. Wind south-southeast around 6 mph, gusting to 25 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 61°. Wind south-southeast around 7 mph, gusting to 22 mph. |
| Friday |
Partly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 88°. UV index up to 7. Wind south-southeast around 6 mph, gusting to 26 mph, in the morning, becoming south-southwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A chance of rain. Scattered thundershowers possible. Low 68°. Wind southeast around 5 mph in the evening, becoming south-southwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 86°. UV index up to 6. Wind south-southwest around 4 mph, gusting to 19 mph, in the morning, becoming east in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 68°. Wind southeast around 5 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
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