Today | Weather | Tuesday, April 7, 2026

Weather in Watertown, South Dakota

08:41 AM
Now
Cloudy Weather
23° F
Feels Like 10°
Precipitation 0 %
Wind 14 mph
UV Index (0 - 11+) 1
Humidity 60 %
Today
Cloudy Weather
Day 41°
Night 36°
Precipitation 7 %
Wind 17 mph
UV Index (0 - 11+) 2
Overnight Frost 12 AM – 8 AM

Watertown Weather Forecast Updated

Last updated on

Air Quality in Watertown

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.93 µg/m³
PM10 1.25 µg/m³
O3 0.048 ppm
NO2 0.9 ppb
SO2 0 ppb
CO 0.13 ppm
NH3 9.62 µg/m³
NO 0.1 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.50.93 µg/m³
PM101.25 µg/m³
O394.75 µg/m³
NO21.7 µg/m³
SO20.08 µg/m³
CO148.91 µg/m³
NH39.62 µg/m³
NO0.1 µg/m³