What is the air quality in Saint Charles today?

The current Air Quality Index (AQI) in Saint Charles is 31 (Good). PM2.5 concentration is 7.4 µg/m³.

What is the temperature in Saint Charles right now?

The current temperature in Saint Charles is 15.4°C (feels like 15.4°C). Humidity is 81.6% and wind speed is 30.1 km/h.

Is it safe to go outside in Saint Charles?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Saint Charles, United States

Drizzle

15.4°C · 81.6% humidity

15.4°

Feels 15.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

42h · 2 stn

View full history →

Saint 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.

81.6%

Humidity

30.1 km/h

Wind E

1019.9 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.4 µg/m³

PM10

27.4 µg/m³

050100150200300500

What is the weather forecast for Saint Charles?

Temperature & Precipitation

PM2.5 Trend

42h · 2 stations

PM2.57.4 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

7.4

Median

7.4

Average

7.4

Low

7.4

High

PM2.5 µg/m³ · Model: 13.5 · Bias: +6.1

What is the 7-day forecast for Saint Charles?

10-20

15.6° 4.4°

10-21

24.8° 15.0°

6.94 mm

10-22

21.9° 11.4°

2.38 mm

10-23

14.4° 11.6°

9.88 mm

10-24

27.6° 14.0°

10-25

18.6° 4.3°

10-26

25.7° 6.0°

0.06 mm

Both models agree Avg diff: 4.5°C

Where are air quality stations near Saint Charles?

Forest Park, Missouri, USA

24.3 km PM2.5: 7.0 µg/m³

What cities are near Saint Charles?

36 Maryland Heights 37 Hazelwood 49 Saint Peters 39 Florissant 36 Overland 36 Creve Coeur 32 Chesterfield 38 Ferguson 38 Old Jamestown 51 O'Fallon

Get AQI alerts for Saint Charles

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-10-20T21:45 UTC.