Today | Weather | Monday, September 21, 2026

Weather in Renton, Washington

10:56 AM
Now
Cloudy Weather
61° F
Feels Like 63°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 2
Humidity 78 %
Today
Cloudy Weather
Day 68°
Night 55°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 3

Renton Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Cloudy Night

Day

70°

Night

52°

Wind

4 mph

Precipitation

6 %

Air Quality in Renton

NOW
23 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.93 µg/m³
PM10 4.25 µg/m³
O3 0.025 ppm
NO2 2.6 ppb
SO2 0.4 ppb
CO 0.12 ppm
NH3 0.31 µg/m³
NO 0.42 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)
PM2.52.93 µg/m³
PM104.25 µg/m³
O348.44 µg/m³
NO24.81 µg/m³
SO21.17 µg/m³
CO134.31 µg/m³
NH30.31 µg/m³
NO0.42 µg/m³