Today | Weather | Wednesday, May 20, 2026

Weather in Bismarck, North Dakota

04:51 PM
Now
Cloudy Weather
70° F
Feels Like 68°
Precipitation 35 %
Wind 20 mph
UV Index (0 - 11+) 3
Humidity 31 %
Today
Partly Sunny with Showers
Day 70°
Night 45°
Precipitation 49 %
Wind 17 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Bismarck Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)

Day

45°

Night

37°

Air Quality in Bismarck

NOW
44 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.02 µg/m³
PM10 1.23 µg/m³
O3 0.048 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 1.99 µg/m³
NO 0.05 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)
PM2.51.02 µg/m³
PM101.23 µg/m³
O394.25 µg/m³
NO20.24 µg/m³
SO20.34 µg/m³
CO110.97 µg/m³
NH31.99 µg/m³
NO0.05 µg/m³