| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 07-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain. High 90°. Heat index up to 94°. UV index up to 8. Wind north around 5 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 68°. Wind northeast around 2 mph, gusting to 21 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Hot. High 91°. Heat index up to 96°. UV index up to 8. Wind south-southwest around 2 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly clear in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 70°. Wind southeast around 3 mph, gusting to 16 mph, in the evening, becoming south after midnight. |
| Thursday |
Partly cloudy. Patchy light fog in the morning. Hot. High 96°. Heat index up to 103°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 24 mph. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 73°. Wind south-southwest around 3 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. Rain likely. Scattered thunderstorms likely. Hot. High 92°. Heat index up to 102°. UV index up to 8. Wind southwest around 7 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 75°. Wind west-southwest around 3 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. High 89°. Heat index up to 98°. UV index up to 6. Wind west-southwest around 4 mph, gusting to 22 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog after midnight. Low 73°. Wind northwest around 2 mph, gusting to 20 mph, in the evening, becoming north after midnight. |
| Sunday |
Partly to mostly sunny. Light to moderate fog in the morning. High 90°. Heat index up to 98°. UV index up to 9. Wind east around 6 mph, gusting to 25 mph. |
| Sunday night |
Clear. Light to moderate fog after midnight. Low 71°. Wind east-northeast around 4 mph, gusting to 22 mph, in the evening, becoming near calm after midnight. |
| Monday |
Sunny. Light to moderate fog in the morning. Hot. High 93°. Heat index up to 102°. UV index up to 9. Wind north-northwest around 2 mph, gusting to 21 mph, in the morning, becoming northeast in the afternoon. |
| Monday night |
Clear. Light to moderate fog after midnight. Low 71°. Wind east-southeast around 3 mph, gusting to 16 mph, in the evening, becoming south-southwest after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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