Today | Weather | Monday, September 21, 2026

Weather in Bismarck, North Dakota

12:53 PM
Now
Cloudy Weather
64° F
Feels Like 66°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 3
Humidity 54 %
Today
Cloudy Weather
Day 66°
Night 46°
Precipitation 7 %
Wind 7 mph
UV Index (0 - 11+) 4

Bismarck Weather Forecast Updated

20 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Sunny Weather

Day

79°

Night

46°

Wind

6 mph

UV Index

40

Precipitation

1 %

Air Quality in Bismarck

NOW
29 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.71 µg/m³
PM10 0.75 µg/m³
O3 0.031 ppm
NO2 0.3 ppb
SO2 0 ppb
CO 0.12 ppm
NH3 0.61 µg/m³
NO 0.11 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)
PM2.50.71 µg/m³
PM100.75 µg/m³
O361.02 µg/m³
NO20.65 µg/m³
SO20.11 µg/m³
CO136.01 µg/m³
NH30.61 µg/m³
NO0.11 µg/m³