What is the air quality in McHenry today?

The current Air Quality Index (AQI) in McHenry is 27 (Good). PM2.5 concentration is 6.5 µg/m³.

What is the temperature in McHenry right now?

The current temperature in McHenry is 18.7°C (feels like 18.7°C). Humidity is 47.3% and wind speed is 59.3 km/h.

Is it safe to go outside in McHenry?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 12.9 (Extreme).

Air Quality in McHenry, United States

Windy

18.7°C · 47.3% humidity

18.7°

Feels 18.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

54 8am

27 11am

24 2pm

24 5pm

34 8pm

54 11pm

54 2am

66 5am

Air Quality Index Trend

45h · 82 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.

47.3%

Humidity

59.3 km/h

Wind NW

1020.3 hPa

Pressure

12.9

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.5 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for McHenry?

Temperature & Precipitation

PM2.5 Trend

45h · 82 stations

PM2.56.5 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX12.9

Extreme

Station readings (2 stations within 25 km)

6.5

Median

6.5

Average

5.8

Low

7.2

High

PM2.5 µg/m³ · Model: 7.35 · Bias: +0.9

Both models agree Avg diff: 6.8°C

Where are air quality stations near McHenry?

Cary, Illinois, USA

12.7 km PM2.5: 6.2 µg/m³

Cary, Illinois, USA

12.7 km PM2.5: 5.8 µg/m³

What cities are near McHenry?

27 Crystal Lake 27 Cary 27 Round Lake 27 Round Lake Beach 27 Lake in the Hills 27 Grayslake 27 Algonquin 26 Lake Zurich 27 Huntley 26 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 2026-09-05T16:29 UTC.