| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 30-Mar-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Mild. Low 58°. Wind south-southwest around 11 mph, gusting to 29 mph. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Unusually warm. High 81°. UV index up to 4. Wind south-southwest around 11 mph, gusting to 28 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely. Precipitation showery or intermittent. Mild. Low 61°. Wind south around 6 mph, gusting to 18 mph, in the evening, becoming 2 mph after midnight. Chance of precipitation 70 percent. Precipitation mostly around an inch. |
| Wednesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Precipitation showery or intermittent. High 65°. Wind east around 4 mph, gusting to 15 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. A chance of rain. Precipitation showery or intermittent. Mild. Low 61°. Wind east-southeast around 6 mph in the evening, becoming south around 11 mph, gusting to 18 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. Breezy and mild. High 71°. Wind south around 14 mph, gusting to 25 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Mild. Low 62°. Wind south around 10 mph, gusting to 21 mph, in the evening, becoming southwest around 5 mph, gusting to 16 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Mostly cloudy to cloudy. Moderate fog in the morning, then patchy light fog in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Warm. High 74°. Wind south around 5 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast 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 thunderstorms likely. Warm. Low 66°. Wind south around 7 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches. |
| Saturday |
Dense overcast. Patchy light fog in the morning, then light to moderate fog in the afternoon. Rain very likely. Scattered thunderstorms likely. Mild. High 70°, but temperatures falling in the afternoon. Wind south around 9 mph, gusting to 26 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between 2 and 3 inches. |
| Saturday night |
Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 47°. Wind west-northwest around 9 mph, gusting to 27 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. High 55°. UV index up to 7. Wind north-northwest around 9 mph, gusting to 26 mph. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 43°. Wind north around 5 mph, gusting to 22 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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