Today | Weather | Wednesday, October 28, 2026

Weather in Sammamish, Washington

11:50 AM
Now
Cloudy Weather
50° F
Feels Like 46°
Precipitation 49 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 82 %
Today
Rainy Weather
Day 54°
Night 39°
Precipitation 98 %
Wind 7 mph
UV Index (0 - 11+) 1

Sammamish Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 28, 2025)
Rainy Weather

Day

57°

Night

46°

Wind

11 mph

UV Index

1

Precipitation

80 %

Air Quality in Sammamish

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.52 µg/m³
PM10 0.99 µg/m³
O3 0.039 ppm
NO2 1 ppb
SO2 0.2 ppb
CO 0.12 ppm
NH3 0.08 µg/m³
NO 0.23 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)
PM2.5 – 0.52 µg/m³
PM10 – 0.99 µg/m³
O3 – 76.33 µg/m³
NO2 – 1.86 µg/m³
SO2 – 0.52 µg/m³
CO – 136.6 µg/m³
NH3 – 0.08 µg/m³
NO – 0.23 µg/m³