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

Curious about the January weather in SeaTac? Wondering if it's an optimal time for a visit? This page provides detailed information on the weather conditions for that month.

In January, SeaTac generally has low temperatures and high rainfall. January falls within the winter season. Anticipate daytime temperatures around 8°C, while night temperatures can drop to 2°C.

SeaTac in January usually receives high rainfall, averaging around 141 mm for the month. Typically around 19 days of rainfall is expected.

The area experiences limited sunny days, amounting to roughly 70 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, January 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 January

Min Temperature 2°C  

Max Temperature 8°C  

Chance of Rain 62%  

Precipitation 141 mm  

Rainy days 19 days  

Humidity 78% *  

Windspeed 18 km/h *  

Sunshine 70 hours *  

Percentage Sunshine 25% *  

Where to go in the United States of America in January

Find out more about the weather in the United States of America in January and which places have the best weather 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 SeaTac in January?

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 in January.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Interested in more climate information?

Weather and Climate 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 climate conditions. Find out where to go with our weather planner.