| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Saturday, 09-Aug-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog after midnight. Low 75°. Wind south-southeast around 6 mph, gusting to 18 mph. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. Hot. High 89°. Heat index up to 98°. UV index up to 9. Wind south-southeast around 8 mph, gusting to 22 mph. |
| Sunday night |
Clear. Patchy light fog after midnight. Low 74°. Wind south-southeast around 8 mph, gusting to 18 mph. |
| Monday |
Sunny. Patchy light fog in the morning. Hot. High 90°. Heat index up to 99°. UV index up to 9. Wind south around 9 mph, gusting to 23 mph. |
| Monday night |
Fair. Light to moderate fog after midnight. A slight chance of rain in the evening. Low 75°. Wind south around 7 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly cloudy. Patchy light fog in the morning. A slight chance of rain. Hot. High 90°. Heat index up to 99°. UV index up to 7. Wind south around 7 mph, gusting to 21 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 partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 76°. Wind south around 5 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly sunny. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Hot. High 90°. Heat index up to 99°. UV index up to 8. Wind south-southwest around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly clear. Moderate fog. Low 74°. Wind south around 4 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 86°. Heat index up to 95°. UV index up to 6. Wind south-southwest around 4 mph, gusting to 15 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind south-southwest around 3 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly cloudy. Moderate fog in the morning, then patchy light fog in the afternoon. A chance of rain. Scattered thundershowers possible. High 84°. Heat index up to 92°. UV index up to 8. Wind south around 6 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming fair after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 74°. Wind south-southwest around 6 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
Powered by Davis Vantage Pro2
and
CumulusMX
v 4.4.5 (b4088)
MXUI Template v 2.2.6 by
Silver Acorn
Valid HTML5