Seattle
Washington, USA
Long-term weather forecast
Long-term weather forecast

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 Enero in Seattle?

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

What is the average humidity in Enero in Seattle?

In Enero, the average relative humidity in Seattle is 78%.

How many days does it rain in Enero in Seattle?

In Enero, in Seattle, Washington, the rain falls for 18.2 days. Throughout Enero, 5.57" (141.5mm) of precipitation is accumulated.

How many days does it snow in Enero in Seattle?

In Enero, in Seattle, Washington, it is snowing for 1.3 days. Throughout Enero, 1.4" (35.6mm) of snow is accumulated.

What is the water temperature in Enero in Seattle?

In Enero, the average ocean temperature in Seattle is 45.5°F (7.5°C). Swimming in 45.5°F (7.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Seattle have in Enero?

The average length of the day in Enero in Seattle, Washington, is 9h.

How long on average sun shines in Enero in Seattle?

The average sunshine in Enero in Seattle is 2.3h.

When is the lowest UV index in Seattle?

Enero, Noviembre and Diciembre, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in Enero in Seattle?

In Seattle, the average daily maximum UV index in Enero is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.
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).