| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Tuesday, 07-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 70°. Wind north-northeast around 2 mph, gusting to 21 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 90°. Heat index up to 96°. UV index up to 8. Wind west around 2 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 71°. Wind south-southeast around 3 mph, gusting to 15 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. Hot. High 95°. Heat index up to 103°. UV index up to 9. Wind south-southwest around 5 mph, gusting to 23 mph. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 72°. Wind southwest around 5 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Scattered thunderstorms likely. High 89°. Heat index up to 96°. UV index up to 8. Wind west-southwest around 4 mph, gusting to 23 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 75°. Wind northwest around 3 mph, gusting to 16 mph, in the evening, becoming west-southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy 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. Scattered thundershowers possible. High 88°. Heat index up to 95°. UV index up to 8. Wind north-northeast around 4 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 74°. Wind northeast around 4 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 87°. Heat index up to 94°. UV index up to 8. Wind east-northeast around 5 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Clear. Moderate fog after midnight. Low 71°. Wind east-northeast around 3 mph, gusting to 21 mph. |
| Monday |
Sunny. Light to moderate fog in the morning. Hot. High 90°. Heat index up to 98°. UV index up to 9. Wind east-northeast around 5 mph, gusting to 23 mph. |
| Monday night |
Clear. Patchy light fog after midnight. Low 70°. Wind east-northeast around 4 mph, gusting to 20 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
Powered by Davis Vantage Pro2
and
CumulusMX
v 4.6.4 (b4128)
MXUI Template v 2.2.6 by
Silver Acorn
Valid HTML5