What is the air quality in St. Charles today?

The current Air Quality Index (AQI) in St. Charles is 18 (Good). PM2.5 concentration is 4.3 µg/m³.

What is the temperature in St. Charles right now?

The current temperature in St. Charles is 25.7°C (feels like 25.7°C). Humidity is 58.5% and wind speed is 35.0 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

Partly Cloudy

25.7°C · 58.5% humidity

25.7°

Feels 25.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

27 7pm

18 10pm

24 1am

24 4am

25 7am

25 10am

24 1pm

25 4pm

Air Quality Index Trend

47h · 29 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.

58.5%

Humidity

35.0 km/h

Wind ESE

1013.9 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.3 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for St. Charles?

Temperature & Precipitation

PM2.5 Trend

47h · 29 stations

PM2.54.3 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Station readings (2 stations within 25 km)

4.3

Median

4.3

Average

4.3

Low

4.3

High

PM2.5 µg/m³ · Model: 5.9 · Bias: +1.6

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

07-22

31.4° 20.8°

0.06 mm

07-23

27.9° 20.3°

4.94 mm

07-24

27.3° 20.1°

07-25

30.3° 19.8°

2.12 mm

07-26

29.1° 21.4°

3.94 mm

07-27

24.0° 22.5°

0.75 mm

07-28

36.6° 21.7°

3.25 mm

Both models agree Avg diff: 3.0°C

Where are air quality stations near St. Charles?

Lee District Park - Fairfax County, Northern Virginia, USA

24.2 km PM2.5: 10.8 µg/m³

What cities are near St. Charles?

18 Saint Charles 19 Waldorf 23 Fort Washington 24 Clinton 21 Fort Hunt 20 Hybla Valley 24 Oxon Hill-Glassmanor 24 Camp Springs 24 Oxon Hill 24 Glassmanor

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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 2026-07-22T02:59 UTC.