Juneau
Alaska, USA
Long-term weather forecast
Long-term weather forecast

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, the same as December, in Juneau, Alaska, is another subzero cold winter month, with average temperature ranging between max 25.7°F (-3.5°C) and min 23.7°F (-4.6°C).

Temperature

The coldest months are January and December, with an average high-temperature of 25.7°F (-3.5°C).

Humidity

January is the most humid month, with an average relative humidity of 92%.

Rainfall

In Juneau, during January, the rain falls for 9.3 days and regularly aggregates up to 9.76" (248mm) of precipitation. In Juneau, Alaska, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Juneau, in January, during 21.9 snowfall days, 58.74" (1492mm) of snow is typically accumulated. In Juneau, Alaska, during the entire year, snow falls for 126.6 days, and aggregates up to 290.12" (7369mm) of snow.

Ocean temperature

In Juneau, the average seawater temperature in January is 41°F (5°C).
Note: 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

In Juneau, the average length of the day is 7.3h.

Sunshine

The average sunshine in Juneau is 2.8h.

UV index

January, April, October through December, with an average maximum UV index of 1, are months with the lowest UV index in Juneau. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 1 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Juneau?

January and December, with an average high-temperature of 25.7°F (-3.5°C), are the coldest months in Juneau.

What is the temperature in January in Juneau?

The average high-temperature, in January, is 25.7°F (-3.5°C), while the average low-temperature is 23.7°F (-4.6°C).

What is the most humid month in Juneau?

January is the most humid month, with an average relative humidity of 92%.

What is the average humidity in January in Juneau?

In January, the average relative humidity in Juneau is 92%.

How many days does it rain in January in Juneau?

In Juneau, Alaska, in January, it is raining for 9.3 days, with typically 9.76" (248mm) of accumulated precipitation.

How many days does it snow in January in Juneau?

In January, in Juneau, Alaska, it is snowing for 21.9 days. Throughout January, 58.74" (1492mm) of snow is accumulated.

What is the water temperature in January in Juneau?

In Juneau, in January, the average water temperature is 41°F (5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

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

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

How many hours of sunshine does Juneau have in January?

In Juneau, the average sunshine in January is 2.8h.

When is the lowest UV index in Juneau?

Months with the lowest UV index are January, April, October through December, with an average maximum UV index of 1.

What is the UV index intensity in January in Juneau?

The average daily maximum UV index in January in Juneau, Alaska, is 1. A UV Index of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV radiation.
Average temperature in January - Juneau, AK
  • Average high temperature in January: 25.7°F

The warmest month (with the highest average high temperature) is July (55.8°F).
Months with the lowest average high temperature are January and December (25.7°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: 92%

The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).

Average rainfall in January - Juneau, AK
  • Average rainfall in January: 9.76"

The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the lowest rainfall) is May (4.13").

Average rainfall days in January - Juneau, AK
  • Average rainfall days in January: 9.3 days

The month with the highest number of rainy days is September (21.9 days).
The month with the lowest number of rainy days is February (4.8 days).

Average snowfall in January - Juneau, AK
  • Average snowfall in January: 58.74"

The month with the highest snowfall is December (62.8").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in January - Juneau, AK
  • Average snowfall days in January: 21.9 days

The month with the highest number of snowfall days is January (21.9 days).
Months with the lowest number of snowfall days are 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: 2.8h

The month with most sunshine is June (Average sunshine: 6.4h).
The month with least sunshine is November (Average sunshine: 2.6h).

Average UV index in January - Juneau, AK
  • Average UV index in January: 1

Months with the highest UV index are May and July (UV index 3).
Months with the lowest UV index are January, April, October, November and December (UV index 1).