Today | Weather | Monday, September 21, 2026

Weather in Bellingham, Washington

10:55 AM
Now
Cloudy Weather
59° F
Feels Like 61°
Precipitation 17 %
Wind 8 mph
UV Index (0 - 11+) 3
Humidity 79 %
Today
Cloudy Weather
Day 66°
Night 52°
Precipitation 49 %
Wind 8 mph
UV Index (0 - 11+) 3

Bellingham Weather Forecast Updated

7 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Cloudy Night

Day

66°

Night

48°

Wind

6 mph

Precipitation

25 %

Air Quality in Bellingham

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

Pollutant Concentrations:

PM2.5 3.25 µg/m³
PM10 4.84 µg/m³
O3 0.010 ppm
NO2 2 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.15 µg/m³
NO 1.21 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)
PM2.53.25 µg/m³
PM104.84 µg/m³
O319.7 µg/m³
NO23.77 µg/m³
SO20.53 µg/m³
CO131.6 µg/m³
NH30.15 µg/m³
NO1.21 µg/m³