SeaTac weather in December (Washington State, United States of America)

Curious about the climate in SeaTac this December? Here’s a detailed forecast of the month’s weather patterns.

Temperatures

December in SeaTac generally includes low temperatures and high rainfall. December is part of winter. Daytime temperatures generally settle around 8°C, while nighttime can see a dip to about 2°C. Expect the coldest temperatures of the year this month. Make sure you have enough winter clothing to stay warm.

Precipitation

SeaTac in December usually receives high rainfall, averaging around 142 mm for the month. On average, there are about 20 days with rain during this month.

Average sunshine

The area experiences limited sunny days, amounting to roughly 54 hours of sunshine. This makes it perfect for those who lean towards cooler, cloudier settings rather than intense sunlit days.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit SeaTac. June, July, August and September typically offer the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized SeaTac climate page with graphs.

 

SeaTac, monthly averages in December

Min Temperature 2°C  

Max Temperature 8°C  

Chance of Rain 66%  

Precipitation 142 mm  

Rainy days 20 days  

Humidity 80% *  

Windspeed 14 km/h *  

Sunshine 54 hours *  

Percentage Sunshine 20% *  

Where to go in the United States of America in December

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

Wear a base layer in cold weather; this is the #1 thing you can do to increase your overall body temperature.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Interested in more climate information?

This site provides you with all the information you need about the climate in SeaTac.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.