Today | Weather | Monday, October 12, 2026

Weather in Watertown, South Dakota

08:08 PM
Now
Cloudy Weather
52° F
Feels Like 45°
Precipitation 0 %
Wind 14 mph
Humidity 85 %
Today
Cloudy Weather
Day 55°
Night 43°
Precipitation 25 %
Wind 11 mph
UV Index (0 - 11+) 2

Watertown Weather Forecast Updated

Air Quality in Watertown

NOW
23 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.5 µg/m³
PM10 0.5 µg/m³
O3 0.024 ppm
NO2 0.8 ppb
SO2 0 ppb
CO 0.12 ppm
NH3 1.02 µg/m³
NO 0 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)
PM2.5 – 0.5 µg/m³
PM10 – 0.5 µg/m³
O3 – 47.83 µg/m³
NO2 – 1.43 µg/m³
SO2 – 0.02 µg/m³
CO – 137.99 µg/m³
NH3 – 1.02 µg/m³
NO – 0 µg/m³