Temperature in Washington State in December

Daytime highs, nighttime lows and the warmest cities in Washington State, the United States of America this December.

Washington State, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in December ranging from -6°C (21°F) in Mount Rainier National Park to 9°C (48°F) in Ilwaco. Nighttime temperatures generally drop to 3°C (37°F) in Ilwaco and -13°C (9°F) in Mount Rainier National Park . December falls during the winter season. On average, it is one of the coldest months of the year.

What is the temperature of the different cities in Washington State, the United States of America in December?

Discover the typical December temperatures for the most popular locations of Washington State on the map below. Detailed insights are just a click away.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

For a detailed overview over the year and the best time to visit Washington State, check out our Washington State's climate page.

See also: Washington State weather by month.

Best Places to Visit in Washington State in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Washington State.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in December: blue is cold, red is hot.

See all December weather averages, cities and regions in Washington State

Washington State temperatures in December: frequently asked questions

How hot does it get in Washington State, the United States of America in December?

Average daytime highs in Washington State, the United States of America during December reach about 8°C (46°F) in Seattle.

How cold does it get at night in Washington State, the United States of America in December?

After dark, Seattle cools to about 2°C (36°F) on an average December night.

What is the warmest city in December in Washington State, the United States of America?

Based on our systematic data collection, Ilwaco has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 9°C (48°F), while at night it goes down to an approximate temperature of 3°C (37°F).

What is the coldest city in December in Washington State, the United States of America?

Our database indicates that in December, Mount Rainier National Park is the city with the coolest temperatures in Washington State, the United States of America. You can expect daytime highs of -6°C (21°F) and nighttime lows close to -13°C (9°F).

How much sun does Washington State, the United States of America get in December?

Most areas see fewer sunny days, with a projection of about 54 hours of sunshine in Seattle. This reduced sunlight makes it ideal for those who prefer cooler, overcast conditions over bright sunny days.

Interested in more climate information?

We have much more information about the climate in Washington State.

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