| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 27-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy to cloudy. Moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. High 75°. UV index up to 4. Wind south-southeast around 11 mph, gusting to 26 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Tonight |
Moderate to dense fog in the evening, then moderate fog after midnight. Rain likely. Scattered thundershowers possible. Low 59°. Wind west-southwest around 5 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Tuesday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the afternoon. High 75°. UV index up to 8. Wind northwest around 5 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 53°. Wind north around 7 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. High 66°. UV index up to 6. Wind north-northwest around 10 mph, gusting to 28 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Cool. Low 46°. Wind north-northwest around 7 mph, gusting to 24 mph, in the evening, becoming 3 mph after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 67°. UV index up to 6. Wind east-southeast around 2 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon. |
| Thursday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 49°. Wind southwest around 4 mph, gusting to 16 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Cool. High 59°. UV index up to 5. Wind northwest around 7 mph, gusting to 27 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly to mostly cloudy. Cool. Low 44°. Wind north around 8 mph, gusting to 27 mph, in the evening, becoming 4 mph after midnight. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 61°. UV index up to 6. Wind northwest around 8 mph, gusting to 27 mph, in the morning, becoming north in the afternoon. |
| Saturday night |
Clear. Cool. Low 44°. Wind northwest around 4 mph, gusting to 21 mph. |
| Sunday |
Sunny. High 67°. UV index up to 9. Wind west-northwest around 7 mph, gusting to 26 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 49°. Wind west-southwest around 6 mph, gusting to 20 mph. |
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