Weather in O'Fallon, Missouri
Friday 6 November 2026 | 22:43
9°
Overcast
Feels like 7°
- High
- 12°
- Low
- 4°
- Humidity
- 77%
- Wind
- 11 km/h
O'Fallon: the next 12 hours at a glance
- No rain expected in the next 12 hours.
- Up to 5° around 22:00.
- Best time to go out: around 09:00 (5°).
Temperature and rain / O'Fallon
The coming days
High
23°
Low
-3°
Average high
16.0°
Average low
4.6°
Total rain
1.2 mm
Average rain
0.1 mm
Air quality - O'Fallon
Particles and ozone
Good
4.50 µg/m³
0-1212-3535-5555+
The air is clean: enjoy the outdoors.
PM104.70µg/m³
Ozone66µg/m³
Data updated hourly
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Frequently asked questions
Quick answers about the weather in O'Fallon
Tomorrow in O'Fallon, expect Broken clouds ☁️, with:\n\n- High of 11°\n- Low of 0°
Need more information?
Our data is updated regularly to give you the most reliable forecast.
Last updated: 2026-11-07