Issaquah (WA) Sunshine Hours by Month

To truly understand a climate, we must look at its sunshine. This page shows the total number of hours of direct sunlight per month and the average hours per day in Issaquah, Washington State, United States of America. This average is based on long-term data collected between 1990 and 2020.

Monthly hours of sunshine

Seasonal sunshine in Issaquah 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

Seasonal changes in sunshine hours are quite obvious in Issaquah. While July receives considerable daily sunshine with up to 10.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.8 hours of sunlight 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%.

Issaquah 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.

Manchester, UK, experiences just around 1420 hours of sunshine annually.

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

In Tokyo, Japan, the average annual sunshine is 1930 hours, with sunny periods between rainy seasons.

November, Issaquah’s wettest month, receives 25 mm (1 in) of rainfall and has a maximum daytime temperature of 9°C (48°F). During the driest month July you can expect a temperature of 24°C (75°F).

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