| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 15-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 80°. UV index up to 7. Wind south-southeast around 9 mph, gusting to 24 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tonight |
Partly cloudy. Patchy light fog after midnight. Low 62°. Wind south around 7 mph, gusting to 20 mph, in the evening, becoming southwest after midnight. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the afternoon. Rain likely. Thunderstorms very likely, some possibly severe. High 75°. UV index up to 4. Wind southwest around 6 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday night |
Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 64°. Wind southeast around 4 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. Hot. High 85°. UV index up to 8. Wind south around 11 mph, gusting to 29 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 69°. Wind south around 10 mph, gusting to 24 mph. |
| Monday |
Mostly cloudy. A chance of rain. Scattered thunderstorms likely, some possibly severe. Breezy and hot. High 86°. UV index up to 7. Wind south around 12 mph, gusting to 29 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly to mostly 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. Thunderstorms very likely, some possibly severe. Warm. Low 72°. Wind south-southeast around 10 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Tuesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. High 75°, but temperatures falling in the afternoon. UV index up to 4. Wind south around 9 mph, gusting to 22 mph, in the morning, becoming west in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Tuesday night |
Cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 60°. Wind northwest around 6 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Partly cloudy. Patchy light fog in the morning. High 72°. UV index up to 7. Wind north around 8 mph, gusting to 27 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 53°. Wind northeast around 5 mph, gusting to 24 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 69°. UV index up to 8. Wind northeast around 7 mph, gusting to 26 mph. |
| Thursday night |
Clear. Cool. Low 51°. Wind northeast around 5 mph, gusting to 22 mph. |
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