What is the air quality in Saint Charles today?

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

What is the temperature in Saint Charles right now?

The current temperature in Saint Charles is 19.3°C (feels like 19.3°C). Humidity is 45.4% and wind speed is 72.8 km/h.

Is it safe to go outside in Saint Charles?

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

Air Quality in Saint Charles, United States

Windy

19.3°C · 45.4% humidity

19.3°

Feels 19.3°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Model forecast

Nearby Monitoring Stations

AQI Forecast

50 10pm

75 1am

75 4am

50 7am

50 10am

25 1pm

25 4pm

37 7pm

45.4%

Humidity

72.8 km/h

Wind S

1018.4 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Saint Charles?

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 Saint Charles?

04-10

22.6° 13.1°

04-11

17.5° 14.3°

23.94 mm

04-12

25.9° 17.1°

0.25 mm

04-13

28.2° 19.4°

0.31 mm

04-14

26.1° 20.9°

0.75 mm

04-15

17.1° 8.8°

3.13 mm

04-16

16.6° 7.8°

7.06 mm

Both models agree Avg diff: 4.8°C

Where are air quality stations near Saint Charles?

Ladue, Missouri, USA

18.7 km

Forest Park, Missouri, USA

24.3 km

What cities are near Saint Charles?

25 Maryland Heights 25 Hazelwood 25 Saint Peters 25 Florissant 25 Overland 25 Creve Coeur 25 Chesterfield 25 Ferguson 25 Old Jamestown 25 O'Fallon

Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-10T01:57 UTC.