Today | Weather | Thursday, September 11, 2025

Weather in Seattle, Washington

04:49 AM

Now

57° F

Feels Like 55°

Precipitation 0 %

Wind 5 mph

Humidity 94 %

Today

Day 70°

Night 57°

Precipitation 0 %

Wind 8

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Seattle Weather Forecast Updated

Last updated on September 11, 2025 3:36 AM

Weather Forecast History

Last Year's Weather on This Day (September 11, 2024)

Day

66°

Night

57°

Wind

4 mph

UV Index

Precipitation

Air quality in Seattle

NOW

66 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 20.51 µg/m³

PM10 23.68 µg/m³

O₃ 8.56 ppb

NO₂ 26.23 ppb

SO₂ 0.97 ppb

CO 333.85 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast