Today | Weather | Wednesday, August 12, 2026

Weather in Watertown, South Dakota

06:49 AM
Now
Cloudy Weather
66° F
Feels Like 68°
Precipitation 49 %
Wind 4 mph
UV Index (0 - 11+) 1
Humidity 94 %
Today
Cloudy Weather
Day 84°
Night 64°
Precipitation 25 %
Wind 8 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Watertown Weather Forecast Updated

Last updated on

Air Quality in Watertown

NOW
20 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 4.75 µg/m³
PM10 4.91 µg/m³
O3 0.012 ppm
NO2 1.3 ppb
SO2 0 ppb
CO 0.12 ppm
NH3 0.68 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)
PM2.54.75 µg/m³
PM104.91 µg/m³
O323.65 µg/m³
NO22.43 µg/m³
SO20.02 µg/m³
CO139.81 µg/m³
NH30.68 µg/m³
NO0 µg/m³