| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 17-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny. A chance of rain. High 90°. Heat index up to 97°. UV index up to 8. Wind west around 3 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Fair. Patchy light fog in the evening, then moderate fog after midnight. A slight chance of rain. Low 74°. Wind west around 5 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly to mostly sunny. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 90°. Heat index up to 100°. UV index up to 10. Wind west around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Low 76°. Wind west around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. Precipitation showery or intermittent. Hot. High 92°. Heat index up to 102°. UV index up to 9. Wind north-northwest around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Precipitation showery or intermittent. Low 73°. Wind east-southeast around 2 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 94°. Heat index up to 105°. UV index up to 9. Wind south-southwest around 4 mph, gusting to 21 mph. |
| Monday night |
Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 75°. Wind southwest around 6 mph, gusting to 16 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain. Precipitation showery or intermittent. Hot. High 93°. Heat index up to 101°. UV index up to 9. Wind west-southwest around 9 mph, gusting to 23 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly clear. Patchy light fog after midnight. Relatively cool. Low 68°. Wind north-northwest around 7 mph, gusting to 20 mph. |
| Wednesday |
Partly cloudy. Patchy light fog in the morning. High 86°. UV index up to 9. Wind north-northwest around 9 mph, gusting to 28 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 65°. Wind north-northwest around 5 mph, gusting to 23 mph. |
| Thursday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 83°. UV index up to 5. Wind north-northeast around 3 mph, gusting to 23 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 64°. Wind east-northeast around 3 mph, gusting to 19 mph, in the evening, becoming south-southeast after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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