Air Quality in Watertown, United States
Drizzle
27.3°C · 58.1% humidity
27.3°
Feels 30.2°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Calibrated model
Nearby Monitoring Stations
Watertown's air quality — share it
AQI Forecast
27
1pm
27
27
60
4pm
51
42
37
7pm
34
31
29
10pm
28
27
27
1am
26
26
26
4am
25
25
25
7am
25
24
24
10am
24
24
Air Quality Index Trend
20h · 1 stnWatertown's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Watertown is 1.1× the WHO 24-hour guideline of 15 µg/m³.
58.1%
Humidity
30.8 km/h
Wind NNW
1014.0 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
16.16 µg/m³
PM10
27.45 µg/m³
050100150200300500
What is the weather forecast for Watertown?
Temperature & Precipitation
PM2.5 Trend
20h · 1 stationPM2.516.16 µg/m³
×1.1 WHO
Moderate
PM1027.45 µg/m³
Good
UV INDEX5.9
High
What is the 7-day forecast for Watertown?
07-21
27.3° 20.2°
1.0 mm
07-22
21.9° 18.0°
2.69 mm
07-23
19.3° 13.5°
2.44 mm
07-24
22.2° 12.0°
3.94 mm
07-25
23.3° 18.6°
11.44 mm
07-26
23.0° 17.1°
4.69 mm
07-27
25.9° 18.4°
1.5 mm
Both models agree
Avg diff: 2.6°C
What cities are near Watertown?
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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 2026-07-21T20:51 UTC.