Weather in O'Fallon, Missouri
Tuesday 17 November 2026
12°
Clear sky
Feels like 7°
- High
- 13°
- Low
- 2°
- Humidity
- 50%
- Wind
- 14 km/h
Temperature and rain / O'Fallon
The coming days
High
22°
Low
-2°
Average high
13.7°
Average low
4.5°
Total rain
54.6 mm
Average rain
3.6 mm
Air quality - O'Fallon
Particles and ozone
Good
8.80 µg/m³
0-1212-3535-5555+
The air is clean: enjoy the outdoors.
PM108.90µg/m³
Ozone47µg/m³
Data updated hourly
Weather nearby
More cities in United StatesWeather guides
All articles
When does winter start 2026? First day of winter and solsticeWinter 2026 starts in the Northern Hemisphere on Monday, December 21, 2026, at 3:50 p.m. EST (20:50 UTC), the...
What is a DANA in Spain? The cold drop storm explainedA DANA is a cut-off low: a pocket of very cold air high in the atmosphere, about 5,000 to 9,000 meters (16,000...
Yellow, amber and red weather warnings: what each color meansA yellow weather warning means weather that could cause some disruption or danger, usually for specific places...
Other cities
Weather in the country's main cities
Frequently asked questions
Quick answers about the weather in O'Fallon
Tomorrow in O'Fallon, expect Clear sky ☀️, with:\n\n- High of 19°\n- Low of 8°
Need more information?
Our data is updated regularly to give you the most reliable forecast.
Last updated: 2026-11-10