What is the air quality in St. Charles today?

The current Air Quality Index (AQI) in St. Charles is 17 (Good). PM2.5 concentration is 3.95 µg/m³.

What is the temperature in St. Charles right now?

The current temperature in St. Charles is 18.9°C (feels like 18.9°C). Humidity is 61.7% and wind speed is 46.2 km/h.

Is it safe to go outside in St. Charles?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in St. Charles, United States

Windy

18.9°C · 61.7% humidity

18.9°

Feels 18.9°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

47h · 5 stn

View full history →

St. 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.

61.7%

Humidity

46.2 km/h

Wind NNW

1010.3 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

3.95 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for St. Charles?

Temperature & Precipitation

PM2.5 Trend

47h · 5 stations

PM2.53.95 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Station readings (2 stations within 25 km)

3.95

Median

3.95

Average

2.4

Low

5.5

High

PM2.5 µg/m³ · Model: 6.25 · Bias: +2.3

What is the 7-day forecast for St. Charles?

06-09

30.8° 10.6°

0.56 mm

06-10

21.8° 19.8°

20.06 mm

06-11

24.5° 14.7°

0.88 mm

06-12

28.7° 20.0°

5.56 mm

06-13

27.5° 22.2°

4.94 mm

06-14

30.7° 14.6°

06-15

32.3° 23.5°

0.06 mm

Both models agree Avg diff: 6.0°C

Where are air quality stations near St. Charles?

Naperville, Illinois, USA

20.5 km PM2.5: 10.1 µg/m³

Naperville, Illinois, USA

20.5 km PM2.5: 2.4 µg/m³

Naperville, Illinois, USA

20.5 km PM2.5: 2.9 µg/m³

What cities are near St. Charles?

17 Geneva 17 Batavia 37 Wasco 38 South Elgin 17 West Chicago 17 North Aurora 17 Bartlett 38 Elgin 22 Carol Stream 38 Streamwood

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T02:13 UTC.