January weather forecast
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

Weather in January

January, like December, is another subzero cold winter month in Juneau, Alaska, with an average temperature fluctuating between 25.7°F (-3.5°C) and 18.7°F (-7.4°C).

Temperature

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

Humidity

The most humid month is January, 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, 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 January, it is snowing for 21.9 days. Throughout January, 58.74" (1492mm) of snow is accumulated. Throughout the year, there are 126.6 snowfall days, and 290.12" (7369mm) of snow is accumulated.

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 January, the average length of the day is 7h and 17min.
On the first day of the month, sunrise is at 8:44 am and sunset at 3:17 pm. On the last day of January, in Juneau, sunrise is at 8:03 am and sunset at 4:18 pm AKST.

Sunshine

In January, the average sunshine 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 reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the coldest months in Juneau?

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

What is the most humid month in Juneau?

With an average relative humidity of 92%, January is the most humid month in Juneau.

What is the average humidity in January in Juneau?

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

How much does it rain in Juneau in January?

In Juneau, Alaska, in January, during 9.3 rainfall days, 9.76" (248mm) of precipitation is typically accumulated.

How many days does it snow in January in Juneau?

In Juneau, Alaska, during January, snow falls for 21.9 days and regularly aggregates up to 58.74" (1492mm) of snow.

How cold is the water in January in Juneau?

In January, the average ocean temperature in Juneau, Alaska, is 41°F (5°C). Swimming in 41°F (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 Juneau have in January?

The average day length in January in Juneau, Alaska, is 7h and 17min.

When are sunrise and sunset in January in Juneau?

In January, on the first day of the month, sunrise is at 8:44 am and sunset at 3:17 pm. On the last day of the month, in Juneau, sunrise is at 8:03 am and sunset at 4:18 pm AKST.

How many hours of sunshine does Juneau have in January?

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

What are the months with the lowest UV index in Juneau?

The months with the lowest UV index in Juneau, Alaska, are January, April, October through December, with an average maximum UV index of 1.

What is the UV index intensity in January in Juneau?

In January, the average daily maximum UV index in Juneau, Alaska, is 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Juneau, AK

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).
The months with the lowest average high temperature are January and December (25.7°F).

  • Average low temperature in January: 18.7°F

The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in January
Juneau, AK

Average pressure in January - Juneau, AK
  • Average pressure in January: 29.86"Hg

The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

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Average wind speed in January
Juneau, AK

Average wind speed in January - Juneau, AK
  • Average wind speed in January: 6.9mph

The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).

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Average humidity in January
Juneau, AK

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%).

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Average rainfall in January
Juneau, AK

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 least rainfall) is May (4.13").

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Average rainfall days in January
Juneau, AK

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 least rainy days is February (4.8 days).

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Average snowfall in January
Juneau, AK

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

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

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Average snowfall days in January
Juneau, AK

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).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in January
Juneau, AK

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).

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Average daylight in January /
Average sunshine in January
Juneau, AK

Average daylight in January / Average sunshine in January - Juneau, AK
  • Average daylight in January: 7h and 17min

The month with the longest days is June (Average daylight: 18h and 9min).
The month with the shortest days is December (Average daylight: 6h and 31min).

  • Average sunshine in January: 2h and 48min

The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).

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Average sunshine days in January
Juneau, AK

Average sunshine days in January - Juneau, AK
  • Average sunshine days in January: 6.2 days

The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).

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Average UV index in January
Juneau, AK

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

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

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Average cloud cover in January
Juneau, AK

Average cloud cover in January - Juneau, AK
  • Average cloud cover in January: 72

The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).

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Average visibility in January
Juneau, AK

Average visibility in January - Juneau, AK
  • Average visibility in January: 4mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).

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