Air Quality in St. Charles, United States
Windy
30.9°C · 40.9% humidity
30.9°
Feels 32.9°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
St. Charles's air quality — share it
AQI Forecast
27
9am
27
27
26
12pm
27
27
25
3pm
25
25
25
6pm
25
25
34
9pm
34
34
34
12am
54
34
34
3am
34
34
34
6am
34
34
Air Quality Index Trend
47h · 1 stnSt. Charles's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
40.9%
Humidity
41.1 km/h
Wind SSE
1016.6 hPa
Pressure
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
6.25 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for St. Charles?
Temperature & Precipitation
PM2.5 Trend
47h · 1 stationPM2.56.25 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX24.9
Extreme
What is the 7-day forecast for St. Charles?
06-09
30.9° 13.7°
1.56 mm
06-10
31.5° 25.6°
1.5 mm
06-11
27.1° 14.1°
06-12
29.6° 17.2°
1.19 mm
06-13
29.7° 22.0°
0.63 mm
06-14
27.4° 20.0°
1.25 mm
06-15
25.2° 12.1°
0.31 mm
Both models agree
Avg diff: 5.5°C
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T16:14 UTC.