Today | Weather | Monday, July 20, 2026

Weather in Bellevue, Washington

02:21 PM
Now
Cloudy Weather
81° F
Feels Like 88°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 8
Humidity 49 %
Today
Cloudy Weather
Day 82°
Night 64°
Precipitation 1 %
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.

Bellevue Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Cloudy Night

Day

72°

Night

55°

Wind

5 mph

Precipitation

24 %

Air Quality in Bellevue

NOW
53 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 9.61 µg/m³
PM10 10.52 µg/m³
O3 0.055 ppm
NO2 0.8 ppb
SO2 1.1 ppb
CO 0.10 ppm
NH3 0.41 µg/m³
NO 0.27 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.59.61 µg/m³
PM1010.52 µg/m³
O3107.7 µg/m³
NO21.45 µg/m³
SO22.76 µg/m³
CO111.96 µg/m³
NH30.41 µg/m³
NO0.27 µg/m³