| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 16-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Precipitation showery or intermittent. Low 73°. Wind southwest around 2 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Partly to mostly sunny. Moderate fog in the morning. Rain likely. Precipitation showery or intermittent. High 89°. Heat index up to 96°. UV index up to 9. Wind west-southwest around 4 mph, gusting to 17 mph, in the morning, becoming 7 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Friday night |
Fair. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Low 75°. Wind west-southwest around 5 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly to mostly sunny. Moderate fog in the morning. A chance of rain. Scattered thundershowers possible. Hot. High 91°. Heat index up to 102°. UV index up to 9. Wind west around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 76°. Wind west around 5 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Scattered thundershowers possible. Hot. High 91°. Heat index up to 101°. UV index up to 8. Wind north around 3 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 75°. Wind east around 2 mph, gusting to 15 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain. Scattered thundershowers possible. Hot. High 93°. Heat index up to 105°. UV index up to 9. Wind south-southeast around 3 mph, gusting to 19 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Low 76°. Wind southwest around 4 mph, gusting to 15 mph. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Hot. High 96°. Heat index up to 108°. UV index up to 9. Wind southwest around 8 mph, gusting to 24 mph, in the morning, becoming northwest in the afternoon. |
| Tuesday night |
Mostly clear in the evening, becoming clear after midnight. Light to moderate fog after midnight. Relatively cool. Low 67°. Wind north around 7 mph, gusting to 19 mph. |
| Wednesday |
Sunny. Light to moderate fog in the morning. High 81°. UV index up to 9. Wind northeast around 8 mph, gusting to 29 mph. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 65°. Wind northeast around 4 mph, gusting to 24 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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