Air Quality in O'Fallon, United States
Windy
16.2°C · 63.5% humidity
16.2°
Feels 16.2°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
AQI Forecast
37
8pm
37
37
37
11pm
50
50
50
2am
50
50
50
5am
37
37
37
8am
37
37
37
11am
37
25
25
2pm
25
25
25
5pm
25
25
63.5%
Humidity
82.3 km/h
Wind S
1019.4 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
What is the weather forecast for O'Fallon?
Temperature & Precipitation
PM2.55.9 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for O'Fallon?
04-09
19.3° 6.8°
04-10
21.3° 9.9°
04-11
18.7° 13.5°
18.19 mm
04-12
24.5° 15.2°
0.88 mm
04-13
26.9° 18.0°
0.19 mm
04-14
24.4° 19.8°
0.62 mm
04-15
16.4° 7.8°
5.0 mm
Both models agree
Avg diff: 5.0°C
Where are air quality stations near O'Fallon?
What cities are near O'Fallon?
Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T23:23 UTC.