| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 07-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 59°. UV index up to 5. Wind east-northeast around 8 mph, gusting to 28 mph. |
| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 40°. Wind east around 8 mph, gusting to 25 mph, in the evening, becoming southeast after midnight. |
| Wednesday |
Partly cloudy. Mild. High 71°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 28 mph. |
| Wednesday night |
Fair to partly cloudy. Low 46°. Wind south around 8 mph, gusting to 22 mph. |
| Thursday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 77°. UV index up to 6. Wind south-southwest around 8 mph, gusting to 26 mph. |
| Thursday night |
Partly cloudy. Low 50°. Wind south around 6 mph, gusting to 16 mph, in the evening, becoming 9 mph after midnight. |
| Friday |
Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 66°. Wind southwest around 6 mph, gusting to 17 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain. Precipitation showery or intermittent. Low 49°. Wind north-northeast around 4 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. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 63°. UV index up to 4. Wind east around 6 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 49°. Wind east around 6 mph, gusting to 16 mph, in the evening, becoming southeast after midnight. |
| Sunday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Unusually warm. High 80°. UV index up to 6. Wind south-southeast around 8 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Sunday night |
Dense overcast in the evening, becoming cloudy after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Breezy and mild. Low 61°. Wind south around 11 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Partly cloudy. Windy and warm. High 79°. UV index up to 8. Wind south-southwest around 17 mph, gusting to 34 mph. |
| Monday night |
Partly cloudy. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Breezy and mild. Low 61°. Wind southwest around 14 mph, gusting to 29 mph, in the evening, becoming 10 mph, gusting to 19 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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