| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 20-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy. Cool. Low 52°. Wind northeast around 4 mph, gusting to 21 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming cloudy in the afternoon. High 71°. UV index up to 6. Wind northeast around 7 mph, gusting to 25 mph, in the morning, becoming east-southeast in the afternoon. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain after midnight. Relatively cool. Low 54°. Wind east-southeast around 6 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Dense overcast. Rain likely. Unusually cool. High 60°. Wind east around 7 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Relatively cool. Low 54°. Wind north-northeast around 3 mph in the evening, becoming northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly cloudy in the morning, becoming mostly cloudy to 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. Scattered thundershowers possible. High 78°. UV index up to 5. Wind south-southwest around 3 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. A chance of rain in the evening. Low 61°. Wind south around 3 mph in the evening, becoming west-southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 79°. UV index up to 7. Wind northwest around 3 mph, gusting to 21 mph, in the morning, becoming north in the afternoon. |
| Sunday night |
Partly to mostly cloudy. Patchy light fog after midnight. Low 60°. Wind north-northeast around 3 mph, gusting to 18 mph, in the evening, becoming east after midnight. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 77°. UV index up to 6. Wind east around 5 mph, gusting to 20 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 65°. Wind east around 5 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Dense overcast. Patchy light fog. Rain likely. Scattered thundershowers possible. High 70°. Wind southeast around 6 mph, gusting to 16 mph, in the morning, becoming 9 mph, gusting to 18 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Precipitation showery or intermittent. Low 64°. Wind southeast around 7 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
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