Seattle (WA) Sunshine Hours by Month

In climate discussions, the hours of sunlight reveal much about a location. This page shows the total number of hours of direct sunlight per month and the average hours per day in Seattle, Washington State, United States of America. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020.

Monthly hours of sunshine

Seasonal sunshine in Seattle varies. It peaks at 312 hours in July and drops to 54 hours in December. The total annual amount of sun is 2171 hours.

Daily hours of sunshine

In Seattle, summer days are longer and more sunny, with daily sunshine hours peaking at 10.4 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.8 hours per day.

Average percent of sunshine

On average the sun shines 65% of the time during the day in July, the highest percentage of any month. December has the lowest percentage at 20%.

Seattle vs Major Cities: Sunshine Compared

Seattle enjoys an average of 2171 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

In Lisbon, Portugal, there are approximately 2801 hours of sunshine annually, highlighting its warm and sunny Mediterranean climate.

In contrast, Tromsø , Norway, receives only about 1270 hours of sunshine per year, known for the polar night with no sunlight for weeks during winter.

Stockholm, Sweden, receives approximately 1907 hours of sunshine annually.

In Brisbane, Australia, the annual sunshine averages 2999 hours, making it one of Australia’s sunniest cities.

Related Climate Data for Seattle

November, Seattle’s wettest month, receives 14 mm (0.6 in) of rainfall and has a maximum daytime temperature of 11°C (52°F). During the driest month July you can expect a temperature of 25°C (77°F).

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Seattle Precipitation page.