| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 10-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy. A chance of rain. Scattered thundershowers possible. High 91°. Heat index up to 96°. UV index up to 7. Wind south around 2 mph, gusting to 21 mph, in the morning, becoming west in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Partly to mostly 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 74°. Wind northwest near calm in the evening, becoming south-southeast after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 84°. UV index up to 7. Wind south around 2 mph, gusting to 19 mph, in the morning, becoming east-northeast in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday night |
Cloudy. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Low 74°. Wind east-northeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 83°. UV index up to 6. Wind east-northeast around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly clear. Patchy light fog in the evening, then light to moderate fog after midnight. Low 70°. Wind east-northeast around 5 mph, gusting to 21 mph. |
| Monday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. High 87°. Heat index up to 92°. UV index up to 7. Wind northeast around 6 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Monday night |
Partly to mostly cloudy. Patchy light fog after midnight. Low 72°. Wind northeast around 5 mph, gusting to 22 mph. |
| Tuesday |
Partly to mostly cloudy. Patchy light fog in the morning. A chance of rain. High 86°. Heat index up to 92°. UV index up to 7. Wind east-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 72°. Wind east around 3 mph, gusting to 20 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. High 88°. Heat index up to 94°. UV index up to 7. Wind southeast around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 72°. Wind south around 2 mph, gusting to 16 mph, in the evening, becoming west after midnight. |
| Thursday |
Partly to mostly sunny. Moderate fog in the morning. Hot. High 91°. Heat index up to 99°. UV index up to 9. Wind west around 5 mph, gusting to 23 mph. |
| Thursday night |
Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 73°. Wind west around 4 mph, gusting to 18 mph. |
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