Today | Weather | Wednesday, September 23, 2026

Weather in Seattle, Washington

09:10 AM
Now
Rainy Weather
55° F
Feels Like 54°
Precipitation 51 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 85 %
Today
Rainy Weather
Day 66°
Night 52°
Precipitation 68 %
Wind 6 mph
UV Index (0 - 11+) 2

Seattle Weather Forecast Updated

31 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 23, 2025)
Night

Day

72°

Night

54°

Wind

5 mph

Precipitation

0 %

Air Quality in Seattle

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

Pollutant Concentrations:

PM2.5 4.76 µg/m³
PM10 10.38 µg/m³
O3 0.017 ppm
NO2 4.8 ppb
SO2 0.3 ppb
CO 0.16 ppm
NH3 0.63 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)
PM2.54.76 µg/m³
PM1010.38 µg/m³
O332.92 µg/m³
NO29.01 µg/m³
SO20.87 µg/m³
CO185.23 µg/m³
NH30.63 µg/m³
NO0.11 µg/m³