| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 28-Sep-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Low 52°. Wind east around 2 mph, gusting to 19 mph. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 82°. UV index up to 5. Wind southeast around 5 mph, gusting to 23 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 59°. Wind southeast around 5 mph, gusting to 16 mph. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually hot. High 86°. UV index up to 5. Wind south-southeast around 7 mph, gusting to 20 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 64°. Wind south-southwest around 7 mph, gusting to 16 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. Unusually hot. High 85°. UV index up to 5. Wind south-southwest around 7 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. Rain likely. Scattered thundershowers possible. Warm. Low 67°. Wind north-northeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. High 69°. Wind north around 6 mph, gusting to 20 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 53°. Wind north-northeast around 7 mph, gusting to 25 mph. |
| Saturday |
Mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. High 74°. UV index up to 6. Wind northeast around 6 mph, gusting to 24 mph. |
| Saturday night |
Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 50°. Wind northeast around 3 mph, gusting to 17 mph. |
| Sunday |
Sunny. Patchy light fog in the morning. High 74°. UV index up to 5. Wind north around 5 mph, gusting to 20 mph, in the morning, becoming 9 mph, gusting to 23 mph, in the afternoon. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 50°. Wind north around 6 mph, gusting to 19 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.