Today | Weather | Wednesday, May 20, 2026

Weather in Federal Way, Washington

02:53 PM
Now
Cloudy Weather
64° F
Feels Like 72°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6
Humidity 51 %
Today
Cloudy Weather
Day 68°
Night 46°
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.

Federal Way Weather Forecast Updated

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

Day

59°

Night

45°

Wind

11 mph

UV Index

4

Precipitation

96 %

Air Quality in Federal Way

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.64 µg/m³
PM10 4 µg/m³
O3 0.038 ppm
NO2 0.9 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 0.15 µg/m³
NO 0.32 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)
PM2.51.64 µg/m³
PM104 µg/m³
O374.96 µg/m³
NO21.65 µg/m³
SO21.46 µg/m³
CO122.16 µg/m³
NH30.15 µg/m³
NO0.32 µg/m³