What is the air quality in McHenry today?

The current Air Quality Index (AQI) in McHenry is 41 (Good). PM2.5 concentration is 9.8 µg/m³.

What is the temperature in McHenry right now?

The current temperature in McHenry is 25.5°C (feels like 25.5°C). Humidity is 34.4% and wind speed is 49.8 km/h.

Is it safe to go outside in McHenry?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 5.9 (High).

Air Quality in McHenry, United States

Windy

25.5°C · 34.4% humidity

25.5°

Feels 25.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

54 6pm

41 9pm

49 12am

52 3am

53 6am

24 9am

24 12pm

24 3pm

Air Quality Index Trend

45h · 70 stn

View full history →

McHenry's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

34.4%

Humidity

49.8 km/h

Wind NNE

1018.6 hPa

Pressure

5.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

9.8 µg/m³

PM10

20.55 µg/m³

050100150200300500

What is the weather forecast for McHenry?

Temperature & Precipitation

PM2.5 Trend

45h · 70 stations

PM2.59.8 µg/m³ ✓ WHO

Good

PM1020.55 µg/m³

Good

UV INDEX5.9

High

Station readings (1 station within 25 km)

9.8

Median

9.8

Average

9.8

Low

9.8

High

PM2.5 µg/m³ · Model: 10.85 · Bias: +1.0

What is the 7-day forecast for McHenry?

08-03

25.7° 17.6°

5.63 mm

08-04

36.4° 13.0°

0.38 mm

08-05

30.5° 12.5°

0.75 mm

08-06

36.0° 20.8°

0.25 mm

08-07

31.3° 14.8°

0.62 mm

08-08

34.8° 15.5°

7.44 mm

08-09

33.6° 23.0°

0.19 mm

Both models agree Avg diff: 4.7°C

Where are air quality stations near McHenry?

Cary, Illinois, USA

12.7 km PM2.5: 9.8 µg/m³

What cities are near McHenry?

41 Crystal Lake 41 Cary 41 Round Lake 41 Round Lake Beach 41 Lake in the Hills 41 Grayslake 41 Algonquin 45 Lake Zurich 41 Huntley 41 Mundelein

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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 2026-08-08T02:05 UTC.