Washington climate

World Climates covers 4 places in Washington. By annual mean temperature, the warmest is Tri-Cities (14 °C57 °F) and the coolest is Spokane (9 °C49 °F). The wettest is Everett with 1,253 mm49 in of precipitation per year, the driest Tri-Cities with 278 mm11 in.

The most common climate types (Köppen classification computed from these averages) are warm-summer Mediterranean (Csb, 2 places), cold semi-arid (BSk, 1 place) and hot-summer continental (dry summer) (Dsa, 1 place).

The highest monthly average high is in Tri-Cities (35 °C94 °F in July); the lowest monthly average low is in Spokane (−5 °C23 °F in December).

Across the places in Washington, the months that most often rank as the most comfortable are June, August and September (4, 3 and 4 of 4 places respectively).

Temperature and rainfall across Washington

Annual mean temperatures in Washington range from 9 °C49 °F to 14 °C57 °F. The typical place (the median of all 4) has a year average of 11 °C52 °F. Annual precipitation ranges from 278 mm11 in to 1,253 mm49 in. The median place receives about 892 mm35 in in an average year.

In 2 places of 4, the coldest month has an average low below 0 °C (32 °F). In 2 places, the warmest month has an average high above 30 °C (86 °F). No place here gets less than 250 mm (10 in) of precipitation a year. None gets more than 2,000 mm (79 in) a year.

Averaged over all 4 places, July is the warmest month, with a mean of 22 °C71 °F. December is the coldest, with 2 °C36 °F. The wettest month on average is November (120 mm4.7 in). The driest is July (14 mm0.5 in). Single places can differ a lot from this average, so check the page of each city.

The table below lists the places sorted by population. The largest ones covered here are Seattle, Tri-Cities and Spokane. Each city page has a chart and a table for every month. It also shows the best time to visit and what to pack. The figures are 25-year averages for 2001–2025 from NASA POWER. They describe grid cells of roughly 50–70 km, not single weather stations.

Climate of each place in Washington

Seattle has a warm-summer Mediterranean climate (Köppen Csb). Its year average is 11 °C52 °F. The warmest month is August, with an average high of 24 °C75 °F. The coldest is December, with an average low of 2 °C35 °F. About 1,232 mm49 in of precipitation falls in a year. November is the wettest month and July the driest. By our comfort score, the best months to visit are June–September.

Tri-Cities has a cold semi-arid climate (Köppen BSk). Its year average is 14 °C57 °F. The warmest month is July, with an average high of 35 °C94 °F. The coldest is December, with an average low of −1 °C30 °F. About 278 mm11 in of precipitation falls in a year. December is the wettest month and July the driest. By our comfort score, the best months to visit are April–June and September and October.

Spokane has a hot-summer continental (dry summer) climate (Köppen Dsa). Its year average is 9 °C49 °F. The warmest month is July, with an average high of 30 °C87 °F. The coldest is December, with an average low of −5 °C23 °F. About 552 mm22 in of precipitation falls in a year. December is the wettest month and July the driest. By our comfort score, the best months to visit are May and June and August and September.

Everett has a warm-summer Mediterranean climate (Köppen Csb). Its year average is 11 °C52 °F. The warmest month is August, with an average high of 24 °C74 °F. The coldest is December, with an average low of 2 °C36 °F. About 1,253 mm49 in of precipitation falls in a year. November is the wettest month and July the driest. By our comfort score, the best months to visit are June–September.

Frequently asked questions

Which is the warmest place in Washington?

By annual mean temperature, the warmest place in Washington is Tri-Cities at 14 °C57 °F. The coolest is Spokane at 9 °C49 °F.

Where does it rain the most in Washington?

Everett gets the most precipitation, 1,253 mm49 in in an average year. The driest place is Tri-Cities with 278 mm11 in.

How many places in Washington does this site cover?

World Climates has climate data for 4 places in Washington. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.

When is the best time to visit Washington?

It depends on the place. Across Washington, the months that most often rank as the most comfortable are June, August and September. Check the page of each city for its own best months.