What is the air quality in O'Fallon today?

The current Air Quality Index (AQI) in O'Fallon is 25 (Good). PM2.5 concentration is 5.9 µg/m³.

What is the temperature in O'Fallon right now?

The current temperature in O'Fallon is 17.6°C (feels like 17.6°C). Humidity is 57.1% and wind speed is 68.9 km/h.

Is it safe to go outside in O'Fallon?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0 (Low).

Air Quality in O'Fallon, United States

Windy

17.6°C · 57.1% humidity

17.6°

Feels 17.6°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Model forecast

Nearby Monitoring Stations

AQI Forecast

37 10pm

75 1am

75 4am

50 7am

37 10am

25 1pm

25 4pm

25 7pm

57.1%

Humidity

68.9 km/h

Wind S

1018.1 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?

04-10

22.1° 11.9°

04-11

17.2° 14.1°

27.81 mm

04-12

25.3° 16.2°

0.06 mm

04-13

27.0° 18.3°

0.25 mm

04-14

25.1° 20.1°

0.88 mm

04-15

15.9° 7.3°

1.88 mm

04-16

16.4° 7.1°

8.56 mm

Both models agree Avg diff: 5.3°C

What cities are near O'Fallon?

25 Saint Peters 25 Wentzville 25 Saint Charles 25 Chesterfield 25 Wildwood 25 Maryland Heights 25 Ballwin 25 Hazelwood 25 Manchester 25 Creve Coeur

Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-10T01:03 UTC.