January weather - Winter 2025

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average sea temperature in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

Blooming fireweed in Juneau, Alaska with snowy mountain peaks in the distance

Weather in January

The year in Juneau, Alaska begins with cold and snowy winter days. January brings the heaviest snowfall of the year, reaching as high as 58.74" (1492mm), and the lowest average temperatures, ranging between 18.7°F (-7.4°C) and 25.7°F (-3.5°C). Though the skies tend to be overcast, with an average of 72% cloud coverage, this month retains a crisp, clear beauty. January is not a time for beach visits, as the sea averages a chilly 41°F (5°C). It should be noted that daylight is limited in the depths of winter, making the days feel short.

Temperature

The temperature in Juneau hits its lowest levels in January and December, recording 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, in January, during 9.3 rainfall days, 9.76" (248mm) of precipitation is typically accumulated. 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 Juneau, in January, during 21.9 snowfall days, 58.74" (1492mm) of snow is typically accumulated. In Juneau, during the entire year, snow falls for 126.6 days and aggregates up to 290.12" (7369mm) of snow.

Ocean temperature

In Juneau, in January, the average water temperature is 41°F (5°C).
Note: It is advised against swimming in 41°F (5°C) when it drops below 50°F (10°C). Such temperatures can cause extreme cold shock, leading to hyperventilation.

Daylight

In Juneau, the average length of the day in January is 7h and 17min.
On the first day of January, sunrise is at 8:45 am and sunset at 3:17 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 4:17 pm AKST.

Sunshine

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

UV index

The months with the lowest UV index are January, April, October through December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 1 during January, leads to 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 best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.

Updated: Jun 3, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

Juneau's temperatures tend to hit their minimum during January and December, with an average high-temperature of 25.7°F (-3.5°C).

How cold is January?

During January, Juneau experiences an average high-temperature of 25.7°F (-3.5°C) and a low-temperature of 18.7°F (-7.4°C).

What is the most humid month?

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

What is the average humidity in January?

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

How much does it rain in January?

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

How much does it snow in Juneau in January?

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

What is the water temperature in January?

In Juneau, the average seawater temperature in January 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.

How many hours of daylight does Juneau have in January?

In Juneau, the average day length in January is 7h and 17min.

When is the sunrise / sunset in January?

In January, on the first day of the month, sunrise is at 8:45 am and sunset at 3:17 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 4:17 pm AKST.

How long on average sun shines in January in Juneau?

The average sunshine duration in January is 2.8h.

What is the month with the lowest UV index?

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

How high is the UV index in January?

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

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

25.7°F -3.5°C

26.2°F -3.2°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.8mph 10.9km/h

7.1mph 11.4km/h

6.5mph 10.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

21.8

21.9

18.3

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

7.6

6.2

8.7

Average UV index

Average cloud cover

Average visibility

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).

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).

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).

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 least 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 least 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").
The months with the least 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).
The months with the least 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: 7h and 2min

The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).

Average sunshine in January: 2h and 5min

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).

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).

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).

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).

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).

January weather forecast
Juneau, AK

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