What is the air quality in Watertown today?

The current Air Quality Index (AQI) in Watertown is 36 (Good). PM2.5 concentration is 8.66 µg/m³.

What is the temperature in Watertown right now?

The current temperature in Watertown is 15.5°C (feels like 15.5°C). Humidity is 68.4% and wind speed is 16.2 km/h.

Is it safe to go outside in Watertown?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Watertown, United States

Partly Cloudy

15.5°C · 68.4% humidity

15.5°

Feels 15.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

5 stations

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 7 stn

View full history →

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

68.4%

Humidity

16.2 km/h

Wind W

999.6 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

8.66 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Watertown?

Temperature & Precipitation

PM2.5 Trend

46h · 7 stations

PM2.58.66 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Station readings (5 stations within 25 km)

8.66

Median

8.61

Average

5.73

Low

16.9

High

PM2.5 µg/m³ · Model: 7.0 · Bias: -1.7

What is the 7-day forecast for Watertown?

06-09

34.8° 13.9°

0.06 mm

06-10

22.5° 12.4°

1.81 mm

06-11

25.8° 9.8°

06-12

21.5° 14.7°

1.25 mm

06-13

30.7° 17.2°

0.5 mm

06-14

24.6° 9.1°

6.5 mm

06-15

24.9° 14.0°

0.38 mm

Both models agree Avg diff: 6.5°C

Where are air quality stations near Watertown?

Nubian Square - DEP Station

9.4 km PM2.5: 5.8 µg/m³

Boston Roxbury

9.5 km PM2.5: 8.4 µg/m³

Boston

10.2 km PM2.5: 11.3 µg/m³

Boston

10.2 km PM2.5: 6.7 µg/m³

Milton Blue Hill Observatory

18.6 km PM2.5: 9.8 µg/m³

What cities are near Watertown?

36 Belmont 35 Brighton 36 Waltham 35 Chestnut Hill 35 Allston 36 Cambridge 33 Brookline 37 Somerville 31 Mission Hill 32 Fenway/Kenmore

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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 2026-06-09T02:13 UTC.