January weather forecast and climate
Juneau, AK

Blooming fireweed in Juneau, Alaska, with snowy mountain peaks in the distance
Blooming fireweed in Juneau, Alaska, with snowy mountain peaks in the distance
January, like December, in Juneau, Alaska, is a cold winter month, with average temperature fluctuating between 23.7°F (-4.6°C) and 32.7°F (0.4°C).

Temperature

January is the coldest month, with an average high-temperature of 32.7°F (0.4°C) and an average low-temperature of 23.7°F (-4.6°C).

Humidity

In January, the average relative humidity is 79.9%.

Rainfall

In Juneau, during January, the rain falls for 20.6 days and regularly aggregates up to 5.4" (135.9mm) of precipitation. Throughout the year, in Juneau, there are 229.8 rainfall days, and 62.3" (1581.6mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Juneau. January is the month with the most snowfall. Snow falls for 10.6 days and accumulates 27.7" (703.6mm) of snow.

Ocean temperature

In Juneau, Alaska, the average seawater temperature is 41°F (5°C). Swimming in 41°F (5°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in January is 7.3h.

Sunshine

The average sunshine in Juneau is 2.6h.

UV index

January, November and December, with an average maximum UV index of 0, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for ordinary individuals.
The daily maximum UV index of 0 in January interpret into the following advice:
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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Juneau?

January is the coldest month in Juneau, with an average high-temperature of 32.7°F (0.4°C) and an average low-temperature of 23.7°F (-4.6°C).

What is the temperature in January in Juneau?

In January, in Juneau, the average high-temperature is 32.7°F (0.4°C), and the average low-temperature is 23.7°F (-4.6°C).

What is the average humidity in January in Juneau?

The average relative humidity in January in Juneau, Alaska, is 79.9%.

How many days does it rain in January in Juneau?

In Juneau, in January, during 20.6 rainfall days, 5.4" (135.9mm) of precipitation is typically accumulated.

How many days does it snow in January in Juneau?

In Juneau, during January, snow falls for 10.6 days and regularly aggregates up to 27.7" (703.6mm) of snow.

What is the snowiest month in Juneau?

January is the month with the most snowfall. Snow falls for 10.6 days and accumulates 27.7" (703.6mm) of snow.

What is the ocean temperature in January in Juneau?

In January, the average ocean temperature is 41°F (5°C). Swimming in 41°F (5°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in January in Juneau?

The average length of the day in January is 7.3h.

How long on average sun shines in January in Juneau?

In Juneau, Alaska, the average sunshine in January is 2.6h.

When is the lowest UV index in Juneau?

January, November and December, with an average maximum UV index of 0, are months with the lowest UV index in Juneau.

How high is the UV index in January in Juneau?

The average daily maximum UV index in January in Juneau, Alaska, is 0. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in January - Juneau, AK
  • Average high temperature in January: 32.8°F

The warmest month (with the highest average high temperature) is July (63.9°F).
The month with the lowest average high temperature is January (32.8°F).

  • Average low temperature in January: 23.7°F

The month with the highest average low temperature is July (50°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

Average humidity in January - Juneau, AK
  • Average humidity in January: 79.9%

The month with the highest relative humidity is September (87.9%).
The month with the lowest relative humidity is May (76.3%).

Average rainfall in January - Juneau, AK
  • Average rainfall in January: 5.4"

Wettest months (with the highest rainfall) are September and October (8.6").
The driest month (with the lowest rainfall) is April (2.9").

Average rainfall days in January - Juneau, AK
  • Average rainfall days in January: 20.6 days

The month with the highest number of rainy days is October (23.9 days).
The month with the lowest number of rainy days is June (15.8 days).

Average snowfall in January - Juneau, AK
  • Average snowfall in January: 27.7"

The month with the highest snowfall is January (27.7").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in January - Juneau, AK
  • Average snowfall days in January: 10.6 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in January - Juneau, AK
  • Average sea temperature in January: 41°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 March (40.3°F).

Average daylight in January / Average sunshine in January - Juneau, AK
  • Average daylight in January: 7.3h

The month with the longest days is June (Average daylight: 18.2h).
The month with shortest days is December (Average daylight: 6.5h).

  • Average sunshine in January: 2.6h

The month with most sunshine is May (Average sunshine: 7.5h).
The month with least sunshine is December (Average sunshine: 1.3h).

Average UV index in January - Juneau, AK
  • Average UV index in January: 0

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, November and December (UV index 0).

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