What is the air quality in McHenry today?

The current Air Quality Index (AQI) in McHenry is 28 (Good). PM2.5 concentration is 6.58 µg/m³.

What is the temperature in McHenry right now?

The current temperature in McHenry is 23.8°C (feels like 23.8°C). Humidity is 72.0% and wind speed is 35.4 km/h.

Is it safe to go outside in McHenry?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 10.9 (Extreme).

Air Quality in McHenry, United States

Cloudy

23.8°C · 72.0% humidity

23.8°

Feels 23.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

24 1pm

28 4pm

24 7pm

25 10pm

27 1am

84 4am

83 7am

146 10am

146

Air Quality Index Trend

48h · 4 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.

72.0%

Humidity

35.4 km/h

Wind E

1014.5 hPa

Pressure

10.9

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.58 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for McHenry?

Temperature & Precipitation

PM2.5 Trend

48h · 4 stations

PM2.56.58 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX10.9

Extreme

What is the 7-day forecast for McHenry?

07-21

27.5° 21.2°

0.62 mm

07-22

24.1° 16.2°

0.38 mm

07-23

23.0° 16.4°

2.25 mm

07-24

27.4° 14.5°

07-25

22.7° 16.9°

0.25 mm

07-26

26.1° 20.2°

3.5 mm

07-27

24.9° 19.2°

2.87 mm

Both models agree Avg diff: 4.0°C

Where are air quality stations near McHenry?

Cary, Illinois, USA

12.7 km PM2.5: 7.7 µg/m³

What cities are near McHenry?

27 Crystal Lake 29 Cary 29 Round Lake 29 Round Lake Beach 30 Lake in the Hills 29 Grayslake 29 Algonquin 40 Lake Zurich 34 Huntley 45 Mundelein

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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 2026-07-21T21:43 UTC.