| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 02-Aug-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. A chance of rain. High 80°. UV index up to 7. Wind north-northwest around 9 mph, gusting to 27 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Relatively cool. Low 62°. Wind north-northeast around 4 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A slight chance of rain. High 83°. UV index up to 8. Wind north-northeast around 3 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair in the evening, becoming clear after midnight. Patchy light fog. Relatively cool. Low 63°. Wind east-northeast around 3 mph in the evening, becoming southeast after midnight. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 87°. UV index up to 8. Wind southeast around 4 mph, gusting to 22 mph. |
| Tuesday night |
Fair to partly cloudy. Relatively cool. Low 66°. Wind southeast around 5 mph, gusting to 18 mph. |
| Wednesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 91°. Heat index up to 95°. UV index up to 8. Wind south-southeast around 5 mph, gusting to 23 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 69°. Wind east-northeast around 5 mph, gusting to 17 mph, in the evening, becoming north-northeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. High 88°. Heat index up to 93°. UV index up to 8. Wind east around 3 mph, gusting to 21 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 70°. Wind north-northeast around 2 mph, gusting to 18 mph, in the evening, becoming east after midnight. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 87°. Heat index up to 92°. UV index up to 6. Wind east around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely. Scattered thundershowers possible. Low 71°. Wind south-southwest around 6 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 94°. Heat index up to 101°. UV index up to 9. Wind south-southwest around 5 mph, gusting to 22 mph. |
| Saturday night |
Mostly clear. Patchy light fog after midnight. Low 71°. Wind southwest around 5 mph. |
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