| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 09-Mar-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. Mild. Low 57°. Wind south-southwest around 9 mph, gusting to 28 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain. Scattered thunderstorms likely. Unusually warm. High 77°. Wind south-southwest around 7 mph, gusting to 21 mph, in the morning, becoming 12 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Unusually mild. Low 60°. Wind south-southwest around 11 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday |
Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Breezy and mild. High 62°, but temperatures falling in the afternoon. Wind west-northwest around 12 mph, gusting to 31 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Wednesday night |
Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 36°. Wind northwest around 10 mph, gusting to 29 mph, in the evening, becoming 6 mph, gusting to 21 mph, after midnight. |
| Thursday |
Sunny. Patchy light fog in the morning. High 57°. Wind southwest around 2 mph, gusting to 21 mph, in the morning, becoming 7 mph, gusting to 23 mph, in the afternoon. |
| Thursday night |
Partly cloudy. Breezy. Low 43°. Wind south-southwest around 9 mph, gusting to 20 mph, in the evening, becoming 16 mph, gusting to 23 mph, after midnight. |
| Friday |
Partly cloudy. Mild. High 64°. UV index up to 4. Wind west-southwest around 10 mph, gusting to 26 mph, in the morning, becoming west-northwest in the afternoon. |
| Friday night |
Partly cloudy in the evening, becoming clear after midnight. Low 35°. Wind north around 5 mph, gusting to 22 mph, in the evening, becoming east after midnight. |
| Saturday |
Sunny. Mild. High 67°. UV index up to 5. Wind east around 8 mph, gusting to 21 mph, in the morning, becoming southeast around 11 mph, gusting to 28 mph, in the afternoon. |
| Saturday night |
Clear in the evening, becoming partly cloudy after midnight. Low 47°. Wind south-southeast around 10 mph, gusting to 22 mph. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. Breezy. High 54°, but temperatures falling in the afternoon. Wind west-southwest around 12 mph, gusting to 26 mph, in the morning, becoming north-northwest around 16 mph, gusting to 33 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming clear after midnight. Breezy and cold. Low 27°. Wind chill ranging from 19 to 36. Wind north-northwest around 14 mph, gusting to 31 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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