| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 19-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Relatively cool. Low 65°. Wind east around 2 mph, gusting to 23 mph, in the evening, becoming south after midnight. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 89°. UV index up to 9. Wind west around 3 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon. |
| Saturday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. A chance of rain. Low 66°. Wind east around 5 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Scattered thundershowers possible. High 80°. UV index up to 6. Wind southeast around 8 mph, gusting to 21 mph, in the morning, becoming south in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Sunday night |
Partly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 69°. Wind west around 7 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Monday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 78°. UV index up to 5. Wind north-northwest around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy to cloudy. Relatively cool. Low 65°. Wind northeast around 4 mph, gusting to 23 mph. |
| Tuesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 81°. UV index up to 8. Wind northeast around 4 mph, gusting to 23 mph. |
| Tuesday night |
Mostly clear. Patchy light fog after midnight. Relatively cool. Low 60°. Wind northeast around 2 mph, gusting to 18 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly 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. High 82°. UV index up to 7. Wind west-southwest around 4 mph, gusting to 22 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Precipitation showery or intermittent. Relatively cool. Low 64°. Wind north-northeast around 3 mph, gusting to 17 mph, in the evening, becoming south after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Thursday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. High 82°. UV index up to 8. Wind west-southwest around 4 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Fair in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind north around 3 mph, gusting to 21 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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