SeaTac Weather in January

During January, SeaTac experiences low daytime temperatures of 8°C (46°F) and cooler nights around 2°C (36°F). As part of the winter season, expect quite a bit of rainfall. Around 141 mm (5.6 in) is typical.

Rainfall in SeaTac in January

Analyzing past climate data, one can expect approximately 19 days of rain, averaging 141 mm (5.6 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in SeaTac in January

January in SeaTac brings typical temperatures with highs around 8°C (46°F) and lows of 2°C (36°F). January is typically considered a winter month. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With overnight lows of 2°C (36°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in SeaTac in January

The city usually sees around 70 hours of sunlight, indicating fewer sunny days.

Wind Speed in SeaTac in January

Average wind conditions reach 5 m/s (10 knots) in January. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July, August and September typically offer the best weather for SeaTac.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our SeaTac's climate page.

SeaTac Temperature in January

Min Temperature 2°C (36°F)  

Max Temperature 8°C (46°F)  

Chance of Rain 62%  

Precipitation 141 mm (5.6 in)  

Rainy days 19 days  

Humidity 78% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 70 hours *  

Percentage Sunshine 25% *  

What to Wear in SeaTac in January

We recommend to layer up for chilly conditions in SeaTac in January. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With limited sunshine expected, sunglasses aren't a priority for packing.

What To Do in SeaTac in January

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

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our SeaTac's climate page.

More climate data for SeaTac

Temperature Rainfall Sunshine Humidity Wind Speed

See the full SeaTac climate overview or explore weather in the United States of America.