Today | Weather | Tuesday, July 21, 2026

Weather in Bismarck, North Dakota

02:09 AM
Now
Night
66° F
Feels Like 63°
Precipitation 0 %
Wind 9 mph
Humidity 79 %
Today
Sunny Weather
Day 81°
Night 55°
Precipitation 5 %
Wind 9 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

54 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 21, 2025)

Day

88°

Night

63°

Air Quality in Bismarck

NOW
32 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.1 µg/m³
PM10 1.14 µg/m³
O3 0.035 ppm
NO2 0.6 ppb
SO2 0.4 ppb
CO 0.10 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)
PM2.51.1 µg/m³
PM101.14 µg/m³
O368.1 µg/m³
NO21.11 µg/m³
SO20.99 µg/m³
CO110.48 µg/m³
NH31.02 µg/m³
NO0 µg/m³