January weather forecast and climate
Olympia, WA

The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington
The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington
January, like December, is a frosty winter month in Olympia, Washington, with average temperature fluctuating between 34.3°F (1.3°C) and 44.6°F (7°C).

Temperature

In Olympia, the average high-temperature in January is essentially the same as in December - a still chilly 44.6°F (7°C). In January, in Olympia, Washington, the average low-temperature is 34.3°F (1.3°C).

Humidity

Months with the highest humidity in Olympia are January, November and December, with an average relative humidity of 89%.

Rainfall

In Olympia, during January, the rain falls for 18.9 days and regularly aggregates up to 5.71" (145mm) of precipitation. Throughout the year, in Olympia, there are 177.4 rainfall days, and 37.05" (941mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Olympia are January through March, November and December. In Olympia, during 1.9 snowfall days, 1.38" (35mm) of snow is typically accumulated. In Olympia, during the entire year, snow falls for 8.7 days, and aggregates up to 5.31" (135mm) of snow.

Daylight

In January, the average length of the day in Olympia is 9h.

Sunshine

In January, the average sunshine in Olympia is 3.5h.

UV index

Months with the lowest UV index in Olympia are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in January in Olympia?

The average high-temperature, in January, in Olympia, Washington, is 44.6°F (7°C), while the average low-temperature is 34.3°F (1.3°C).

What is the most humid month in Olympia?

January, November and December, with an average relative humidity of 89%, are most humid months.

What is the average humidity in January in Olympia?

In Olympia, Washington, the average relative humidity in January is 89%.

How much does it rain in Olympia in January?

In Olympia, in January, it is raining for 18.9 days, with typically 5.71" (145mm) of accumulated precipitation.

How much does it snow in Olympia in January?

In Olympia, in January, during 1.9 snowfall days, 1.38" (35mm) of snow is typically accumulated.

How many hours of daylight does Olympia have in January?

In Olympia, the average length of the day in January is 9h.

How many hours of sunshine does Olympia have in January?

In Olympia, the average sunshine in January is 3.5h.

When is the lowest UV index in Olympia?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in January in Olympia?

The average daily maximum UV index in January in Olympia, Washington, is 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.
Average temperature in January - Olympia, WA
  • Average high temperature in January: 7°C

The warmest month (with the highest average high temperature) is August (25.9°C).
The month with the lowest average high temperature is December (6.1°C).

  • Average low temperature in January: 1.3°C

The month with the highest average low temperature is August (10.3°C).
The coldest month (with the lowest average low temperature) is December (0.8°C).

Average pressure in January - Olympia, WA
  • Average pressure in January: 1018.9mbar

The month with the highest atmospheric pressure is January (1018.9mbar).
The month with the lowest atmospheric pressure is March (1016.4mbar).

Average wind speed in January - Olympia, WA
  • Average wind speed in January: 7.3km/h

The windiest months (with the highest average wind speed) are March and November (7.4km/h).
The calmest month (with the lowest average wind speed) is September (6.1km/h).

Average humidity in January - Olympia, WA
  • Average humidity in January: 89%

Months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is July (71%).

Average rainfall in January - Olympia, WA
  • Average rainfall in January: 145mm

The wettest month (with the highest rainfall) is December (147mm).
The driest month (with the least rainfall) is July (10mm).

Average rainfall days in January - Olympia, WA
  • Average rainfall days in January: 18.9 days

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (5.5 days).

Average snowfall in January - Olympia, WA
  • Average snowfall in January: 35mm

The month with the highest snowfall is February (59mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in January - Olympia, WA
  • Average snowfall days in January: 1.9 days

The month with the highest number of snowfall days is February (3.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in January: 3.5h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is December (Average sunshine: 3.4h).

Average sunshine days in January - Olympia, WA
  • Average sunshine days in January: 9.8 days

The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.4 days).

Average UV index in January - Olympia, WA
  • Average UV index in January: 2

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in January - Olympia, WA
  • Average cloud cover in January: 65

Months with the most cloud cover are January and December (Cloud cover 65).
Months with the least cloud cover are July and August (Cloud cover 35).

Average visibility in January - Olympia, WA
  • Average visibility in January: 6km

Months with the highest visibility are June, July and August (8km).
Months with the lowest visibility are January, February, November and December (6km).