| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 03-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 72°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Tonight |
Partly to mostly cloudy. Low 52°. Wind west-southwest around 4 mph, gusting to 22 mph. |
| Monday |
Partly to mostly cloudy. A slight chance of rain. Scattered thundershowers possible. High 75°. UV index up to 5. Wind south-southwest around 10 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Low 58°. Wind south-southwest around 6 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tuesday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 62°, but temperatures falling in the afternoon. Wind north-northeast around 5 mph, gusting to 22 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Tuesday night |
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Cool. Low 50°. Wind north-northeast around 6 mph, gusting to 25 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. Cool. High 61°. UV index up to 4. Wind north-northeast around 6 mph, gusting to 24 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Cool. Low 45°. Wind north around 5 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly sunny in the morning, becoming sunny in the afternoon. Cool. High 61°. UV index up to 6. Wind northwest around 6 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 48°. Wind west-southwest around 6 mph, gusting to 19 mph. |
| Friday |
Mostly cloudy to cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 68°. Wind southwest around 6 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. A slight chance of rain. Cool. Low 48°. Wind north around 4 mph, gusting to 17 mph, in the evening, becoming west-southwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Sunny. Patchy light fog in the morning. High 77°. UV index up to 9. Wind southwest around 4 mph, gusting to 22 mph. |
| Saturday night |
Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 57°. Wind south-southeast around 8 mph, gusting to 20 mph. |
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