| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Thursday, 16-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Today |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Hot. High 91°. Heat index up to 97°. UV index up to 9. Wind northwest around 2 mph, gusting to 20 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Partly to mostly cloudy. Light to moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 74°. Wind southwest around 2 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Partly cloudy. Light to moderate fog in the morning. A chance of rain. High 90°. Heat index up to 99°. UV index up to 8. Wind west-southwest around 5 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Friday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain. Low 75°. Wind west-southwest around 5 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. Hot. High 92°. Heat index up to 103°. UV index up to 9. Wind west-southwest around 8 mph, gusting to 25 mph. |
| Saturday night |
Fair to partly cloudy. Moderate fog after midnight. A chance of rain. Low 75°. Wind west around 5 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Hot. High 94°. Heat index up to 105°. UV index up to 10. Wind west around 3 mph, gusting to 20 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain after midnight. Low 74°. Wind east around 2 mph, gusting to 16 mph, in the evening, becoming south after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Precipitation showery or intermittent. Hot. High 94°. Heat index up to 104°. UV index up to 7. Wind southwest around 4 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Moderate fog after midnight. A slight chance of rain. Precipitation showery or intermittent. Low 76°. Wind southwest around 4 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly cloudy. A chance of rain. Precipitation showery or intermittent. Very hot. High 99°. Heat index up to 110°. UV index up to 9. Wind west around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly to mostly 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 71°. Wind northeast around 7 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Relatively cool. High 78°. UV index up to 5. Wind east-southeast around 6 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Wednesday night |
Cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 69°. Wind east-southeast around 5 mph, gusting to 22 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