| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 22-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy. High 77°. UV index up to 7. Wind east around 5 mph, gusting to 26 mph. |
| Tonight |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 61°. Wind northeast around 3 mph, gusting to 23 mph, in the evening, becoming north-northwest after midnight. |
| Saturday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 80°. UV index up to 6. Wind north-northwest around 3 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon. |
| Saturday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 63°. Wind west around 3 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. High 78°. UV index up to 5. Wind west-northwest around 3 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 63°. Wind east around 2 mph, gusting to 18 mph. |
| Monday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thundershowers possible. High 81°. UV index up to 6. Wind east-southeast around 4 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy to cloudy. Patchy light fog after midnight. A slight chance of rain in the evening. Scattered thunderstorms likely. Low 67°. Wind east-southeast around 3 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. High 78°. UV index up to 5. Wind east around 6 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Dense overcast. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely. Thunderstorms very likely, some possibly severe. Low 68°. Wind east around 6 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Cloudy. Light to moderate fog. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. High 72°. Wind east around 6 mph, gusting to 17 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 67°. Wind east-southeast around 7 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 78°. UV index up to 7. Wind east-southeast around 8 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Thursday night |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog. A chance of rain. Thunderstorms very likely, some possibly severe. Low 70°. Wind east-southeast around 7 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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