| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 05-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 69°. UV index up to 6. Wind north-northeast around 9 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Cool. Low 49°. Wind north-northeast around 7 mph, gusting to 23 mph, in the evening, becoming 4 mph, gusting to 16 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Mostly cloudy to cloudy. A slight chance of rain. Cool. High 61°. Wind north-northeast around 3 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 44°. Wind north around 3 mph, gusting to 20 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 66°. UV index up to 7. Wind west-southwest around 4 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon. |
| Thursday night |
Clear in the evening, becoming mostly clear after midnight. Cool. Low 45°. Wind southwest around 5 mph, gusting to 20 mph. |
| Friday |
Mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the afternoon. High 74°. UV index up to 6. Wind southwest around 9 mph, gusting to 28 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly cloudy in the evening, becoming clear after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Cool. Low 49°. Wind west-southwest around 4 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. High 77°. UV index up to 7. Wind west-southwest around 6 mph, gusting to 24 mph. |
| Saturday night |
Partly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 57°. Wind southeast around 6 mph in the evening, becoming southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 70°. UV index up to 7. Wind north-northwest around 9 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly clear in the evening, becoming clear after midnight. Cool. Low 48°. Wind north-northwest around 7 mph, gusting to 24 mph, in the evening, becoming 3 mph after midnight. |
| Monday |
Sunny. High 74°. UV index up to 9. Wind southwest around 5 mph, gusting to 24 mph. |
| Monday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 52°. Wind south around 7 mph, gusting to 19 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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