Today | Weather | Wednesday, May 20, 2026

Weather in Renton, Washington

02:53 PM
Now
Cloudy Weather
66° F
Feels Like 72°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6
Humidity 50 %
Today
Cloudy Weather
Day 70°
Night 50°
Precipitation 1 %
Wind 7 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.

Renton Weather Forecast Updated

54 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Partly Sunny with Showers

Day

61°

Night

48°

Wind

11 mph

UV Index

4

Precipitation

96 %

Air Quality in Renton

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.76 µg/m³
PM10 3.95 µg/m³
O3 0.037 ppm
NO2 1 ppb
SO2 0.7 ppb
CO 0.11 ppm
NH3 0.19 µg/m³
NO 0.34 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)
PM2.51.76 µg/m³
PM103.95 µg/m³
O372.38 µg/m³
NO21.81 µg/m³
SO21.73 µg/m³
CO121.78 µg/m³
NH30.19 µg/m³
NO0.34 µg/m³