Average humidity in Seattle (WA)

On this page you find more information about the monthly relative humidity over the year in Seattle (Washington State), the United States of America.

Seattle's humidity levels vary throughout the year. The highest levels occur in December, reaching 80% (very high), while the lowest is recorded in July at 65%.

Throughout the year, the average humidity in Seattle is 73%.

Humidity plays an important role in how temperatures are felt. During the warmest month, July, the maximum average temperature is around 25°C. Combined with high humidity during this period, the temperature can feel even warmer than the thermometer shows.

During the coldest month, December, the maximum average temperature is around 8°C. This period has very high humidity. When winter temperatures are low and humidity is high, it can make the air feel even colder than it actually is. Check out our detailed temperature page for more information.