| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 12-Sep-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. Very hot. High 92°. UV index up to 7. Wind west-southwest around 3 mph, gusting to 23 mph. |
| Tonight |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 67°. Wind north-northwest near calm. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain in the afternoon. Unusually hot. High 91°. UV index up to 6. Wind north-northwest around 3 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Fair to partly cloudy. Patchy light fog after midnight. A slight chance of rain. Low 61°. Wind northeast around 6 mph, gusting to 15 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 83°. UV index up to 6. Wind east around 8 mph, gusting to 25 mph. |
| Monday night |
Clear. Low 60°. Wind southeast around 8 mph, gusting to 20 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. A chance of rain. Very hot. High 91°. UV index up to 6. Wind south-southwest around 7 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 68°. Wind south around 5 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A slight chance of rain. Very hot. High 92°. Heat index up to 99°. UV index up to 6. Wind south around 5 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 69°. Wind south around 5 mph, gusting to 16 mph. |
| Thursday |
Partly cloudy. Patchy light fog in the morning. Very hot. High 93°. Heat index up to 100°. UV index up to 5. Wind south-southwest around 3 mph, gusting to 16 mph, in the morning, becoming west-northwest in the afternoon. |
| Thursday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 69°. Wind northeast around 4 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Warm. High 85°. UV index up to 6. Wind northeast around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 69°. Wind east around 4 mph, gusting to 17 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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