| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 06-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Cool. High 62°. UV index up to 7. Wind northwest around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Unusually cool. Low 40°. Wind north-northwest around 5 mph, gusting to 23 mph, in the evening, becoming 2 mph after midnight. |
| Thursday |
Mostly sunny. High 64°. UV index up to 6. Wind southwest around 5 mph, gusting to 28 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Thursday night |
Fair. Unusually cold. Low 41°. Wind west-southwest around 6 mph, gusting to 22 mph. |
| Friday |
Partly to mostly sunny in the morning, becoming cloudy in the afternoon. A chance of rain in the afternoon. Scattered thundershowers possible. High 73°. UV index up to 5. Wind southwest around 6 mph, gusting to 26 mph, in the morning, becoming west in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming clear after midnight. Moderate fog. Rain likely. Scattered thundershowers possible. Cool. Low 49°. Wind west around 4 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday |
Sunny. Light to moderate fog in the morning. High 77°. UV index up to 7. Wind southwest around 6 mph, gusting to 25 mph. |
| Saturday night |
Fair in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain after midnight. Scattered thundershowers possible. Low 57°. Wind south-southwest around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 67°. UV index up to 5. Wind north-northwest around 6 mph, gusting to 23 mph, in the morning, becoming 13 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Clear. Cool. Low 48°. Wind north-northwest around 9 mph, gusting to 26 mph, in the evening, becoming 4 mph after midnight. |
| Monday |
Sunny. High 71°. UV index up to 7. Wind north-northwest around 4 mph, gusting to 23 mph, in the morning, becoming west-southwest in the afternoon. |
| Monday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Cool. Low 50°. Wind south around 8 mph, gusting to 18 mph, in the evening, becoming 11 mph, gusting to 18 mph, after midnight. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Breezy. High 74°. UV index up to 7. Wind south around 13 mph, gusting to 29 mph, in the morning, becoming west-southwest in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. A slight chance of rain. Scattered thundershowers possible. Cool. Low 49°. Wind north-northwest around 10 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
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