Today | Weather | Wednesday, May 20, 2026

Weather in Sammamish, Washington

02:53 PM
Now
Cloudy Weather
64° F
Feels Like 72°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 6
Humidity 57 %
Today
Cloudy Weather
Day 68°
Night 48°
Precipitation 25 %
Wind 6 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

Sammamish Weather Forecast Updated

Last updated on

Air Quality in Sammamish

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.02 µg/m³
PM10 3.94 µg/m³
O3 0.033 ppm
NO2 1.1 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 0.27 µg/m³
NO 0.43 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)
PM2.52.02 µg/m³
PM103.94 µg/m³
O365.72 µg/m³
NO22.07 µg/m³
SO21.63 µg/m³
CO122.38 µg/m³
NH30.27 µg/m³
NO0.43 µg/m³