Today | Weather | Monday, September 21, 2026

Weather in Kennewick, Washington

10:56 AM
Now
Sunny Weather
72° F
Feels Like 75°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 3
Humidity 41 %
Today
Cloudy Weather
Day 88°
Night 57°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4

Kennewick Weather Forecast Updated

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

Day

72°

Night

46°

Wind

6 mph

Precipitation

1 %

Air Quality in Kennewick

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.65 µg/m³
PM10 3.69 µg/m³
O3 0.026 ppm
NO2 1.3 ppb
SO2 0 ppb
CO 0.13 ppm
NH3 1.46 µg/m³
NO 0.98 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)
PM2.52.65 µg/m³
PM103.69 µg/m³
O351.05 µg/m³
NO22.49 µg/m³
SO20.08 µg/m³
CO145.79 µg/m³
NH31.46 µg/m³
NO0.98 µg/m³