January weather forecast and climate
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
January is the coldest month with 78% humidity and extremely low temperatures in the range of 35.6°F (2°C) to 44.6°F (7°C) accompanied by one and a half days of snowing and a resultant 1.4" (35.6mm) of snowfall. The nights are chillier, and cold winds blow often. Warm winter coats are required for a day out in the snow.
Rainfall is high with the rain gauge reading 5.8" (147.3mm) across eighteen days of rain, rendering January a wet, cold, and icy month.
Sunshine lasts for two hours per day throughout January. Outdoor activities are reduced considerably, of course, including swimming since the sea temperatures are at freezing cold 46.4°F (8°C).

What is the temperature in January in Seattle?

In Seattle, Washington, in January, the average high-temperature is 47.1°F (8.4°C), and the average low-temperature is 36.9°F (2.7°C).

How much does it rain in Seattle in January?

In Seattle, during January, the rain falls for 18.2 days and regularly aggregates up to 5.6" (141.5mm) of precipitation.

How many days does it snow in January in Seattle?

In Seattle, in January, snow falls for 1.3 days, with typically accumulated 1.4" (35.6mm) of snow.
Average temperature in January - Seattle, WA
  • Average high temperature in January: 47.2°F

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (45.7°F).

  • Average low temperature in January: 36.9°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (35.6°F).

Average humidity in January - Seattle, WA
  • Average humidity in January: 78%

The month with the highest relative humidity is December (80.1%).
The month with the lowest relative humidity is July (65.4%).

Average rainfall in January - Seattle, WA
  • Average rainfall in January: 5.6"

The wettest month (with the highest rainfall) is November (6.6").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in January - Seattle, WA
  • Average rainfall days in January: 18.2 days

The month with the highest number of rainy days is November (18.4 days).
The month with the lowest number of rainy days is August (4.8 days).

Average snowfall in January - Seattle, WA
  • Average snowfall in January: 1.4"

Months with the highest snowfall are February and December (1.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in January - Seattle, WA
  • Average snowfall days in January: 1.3 days

The month with the highest number of snowfall days is December (1.6 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in January - Seattle, WA
  • Average sea temperature in January: 45.6°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

Average daylight in January / Average sunshine in January - Seattle, WA
  • Average daylight in January: 9h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in January: 2.3h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 1.7h).

Average UV index in January - Seattle, WA
  • Average UV index in January: 1

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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