O'Fallon, Missouri 14-day weather forecast
Sunday 8 November 2026 | 09:25
8°
Clear sky
Feels like 4°
- High
- 12°
- Low
- 0°
- Humidity
- 68%
- Wind
- 9 km/h
14-day forecast / O'Fallon
The trend for the next two weeks
- Today7 NovFew clouds12° / 0°0 mm0%6 – 9 km/hWest3Moderate
- Tomorrow8 NovClear sky17° / 2°0 mm0%11 – 16 km/hWest4Moderate
- Monday9 NovClear sky21° / 3°0 mm0%11 – 15 km/hWest4Moderate
- Tuesday10 NovClear sky22° / 9°0 mm1%11 – 15 km/hSouth-West4Moderate
- Wednesday11 NovOvercast16° / 10°0.4 mm34%16 – 23 km/hNorth1Low
- Thursday12 NovOvercast9° / 4°1.1 mm13%19 – 28 km/hNorth2Low
- Friday13 NovClear sky8° / -1°0 mm2%15 – 22 km/hNorth3Moderate
- Saturday14 NovClear sky9° / -2°0 mm1%10 – 14 km/hNorth-West3Moderate
- Sunday15 NovClear sky17° / 1°0 mm3%12 – 17 km/hSouth-West3Moderate
- Monday16 NovBroken clouds21° / 7°0 mm3%11 – 15 km/hSouth3Moderate
- Tuesday17 NovShowers19° / 12°20.1 mm12%17 – 24 km/hSouth3Moderate
- Wednesday18 NovLight drizzle17° / 10°7.2 mm17%20 – 28 km/hSouth-West3Moderate
- Thursday19 NovLight drizzle17° / 9°1.5 mm26%17 – 25 km/hSouth2Low
- Friday20 NovOvercast21° / 13°0.6 mm43%21 – 31 km/hSouth-West3Moderate
Temperature and rain / O'Fallon
The coming days
High
22°
Low
-2°
Average high
16.4°
Average low
5.7°
Total rain
30.9 mm
Average rain
2.1 mm
Air quality - O'Fallon
Particles and ozone
Good
8.70 µg/m³
0-1212-3535-5555+
The air is clean: enjoy the outdoors.
PM108.80µg/m³
Ozone33µg/m³
Data updated hourly
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Frequently asked questions
Quick answers about the weather in O'Fallon
Tomorrow in O'Fallon, expect Clear sky ☀️, with:\n\n- High of 17°\n- Low of 2°
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Our data is updated regularly to give you the most reliable forecast.
Last updated: 2026-11-08