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

Monthly 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, is another cold winter month in Juneau, Alaska, with average temperature varying between 23.7°F (-4.6°C) and 32.7°F (0.4°C). With an average high-temperature of 32.7°F (0.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month. Weather in January »
The last month of the winter, February, is also a wintry month in Juneau, Alaska, with temperature in the range of an average high of 35.2°F (1.8°C) and an average low of 25°F (-3.9°C). In Juneau, Alaska, the average high-temperature is almost the same as in January - a still wintry 35.2°F (1.8°C). Weather in February »

The first month of the spring, March, is still a cold month in Juneau, Alaska, with average temperature fluctuating between 28°F (-2.2°C) and 39.6°F (4.2°C). In March, the average high-temperature is relatively the same as in February - a still cold 39.6°F (4.2°C). Weather in March »

April is a frosty spring month in Juneau, Alaska, with average temperature varying between 33.3°F (0.7°C) and 48.4°F (9.1°C). In April, the average high-temperature slightly increases, from a wintry 39.6°F (4.2°C) in March, to a chilly 48.4°F (9.1°C). Weather in April »

May, the last month of the spring, in Juneau, is a mild month, with average temperature varying between 40.6°F (4.8°C) and 56.7°F (13.7°C). In May, the average high-temperature marginally rises, from a chilly 48.4°F (9.1°C) in April, to a moderate 56.7°F (13.7°C). Weather in May »

June, the first month of the summer, in Juneau, is an enjoyable month, with temperature in the range of an average high of 62.2°F (16.8°C) and an average low of 46.9°F (8.3°C). In Juneau, Alaska, the average high-temperature in June marginally rises, from a moderate 56.7°F (13.7°C) in May, to a comfortable 62.2°F (16.8°C). Weather in June »

July, like June, in Juneau, Alaska, is another comfortable summer month, with temperature in the range of an average low of 50°F (10°C) and an average high of 63.9°F (17.7°C). The warmest month is July, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 50°F (10°C). Weather in July »

August, the last month of the summer, in Juneau, is also an enjoyable month, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 62.8°F (17.1°C). In Juneau, the average high-temperature is almost the same as in July - a still comfortable 62.8°F (17.1°C). Weather in August »

September, the first month of the autumn, in Juneau, is also a moderate month, with average temperature fluctuating between 44.4°F (6.9°C) and 55.8°F (13.2°C). In September, the average high-temperature slightly decreases, from a comfortable 62.8°F (17.1°C) in August, to a mild 55.8°F (13.2°C). Weather in September »

October, like September, is a frosty autumn month in Juneau, Alaska, with average temperature varying between 37.8°F (3.2°C) and 46.9°F (8.3°C). In October, the average high-temperature marginally drops, from a mild 55.8°F (13.2°C) in September, to a frosty 46.9°F (8.3°C). Weather in October »

November, the last month of the autumn, in Juneau, is another cold month, with average temperature ranging between max 37.8°F (3.2°C) and min 29.1°F (-1.6°C). In Juneau, the average high-temperature decreases, from a chilly 46.9°F (8.3°C) in October, to a cold 37.8°F (3.2°C). Weather in November »

December, the first month of the winter, in Juneau, is still a cold month, with average temperature ranging between max 34.2°F (1.2°C) and min 25.5°F (-3.6°C). In Juneau, the average high-temperature is practically the same as in November - a still wintry 34.2°F (1.2°C). Weather in December »

What 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), January is the coldest month in Juneau.

How many days does it rain in Juneau?

Throughout the year, in Juneau, there are 229.8 rainfall days, and 62.3" (1581.6mm) of precipitation is accumulated.

When does it snow in Juneau?

January through April, October through December are months with snowfall in Juneau, Alaska.

How much does it snow in Juneau?

In Juneau, during the entire year, snow falls for 43.1 days, and aggregates up to 86.7" (2202mm) of snow.

When does it snow the most in Juneau?

The month with the most snowfall in Juneau, Alaska, is January when snow falls for 10.6 days and typically aggregates up to 27.7" (703.6mm) of snow.

What is the month with 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.

When is the ocean coldest in Juneau?

With an average ocean temperature of 40.5°F (4.7°C), March is the month with the coldest seawater. For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the driest month in Juneau?

The month with the least rainfall in Juneau, Alaska, is April when the rain falls for 17 days and typically collects 2.9" (74.7mm) of precipitation.

What is the least humid month in Juneau?

The least humid month is May, with an average relative humidity of 76.3%.

What month has the most sunshine in Juneau?

The month with the most sunshine in Juneau, Alaska, is May, with an average of 7.5h of sunshine.

When are the longest days in Juneau?

June has the longest days of the year, with an average of 18.2h of daylight.

What is the month with the highest UV index in Juneau?

Months with the highest UV index are June and July, with an average maximum UV index of 5.

What is the warmest month in Juneau?

The warmest month in Juneau is July, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 50°F (10°C).

What is the month with the warmest ocean in Juneau?

August is the month with the warmest seawater in Juneau, with an average ocean temperature of 53.4°F (11.9°C). Swimming in 53.4°F (11.9°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 most humid month in Juneau?

The most humid month is September, with an average relative humidity of 87.9%.

What is the rainiest month in Juneau?

The month with the most rainfall in Juneau, Alaska, is September when the rain falls for 22.4 days and typically aggregates up to 8.6" (219.5mm) of precipitation.

What is the month with the shortest days in Juneau?

December has the shortest days of the year in Juneau, with an average of 6.5h of daylight.

What is the month with the least sunshine in Juneau?

With an average of 1.3h of sunshine, December has the least sunshine of the year in Juneau.
Average humidity - Juneau, AK

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

Average rainfall - Juneau, AK
Average rainfall days - Juneau, AK

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 - Juneau, AK
Average snowfall days - Juneau, AK

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 - Juneau, AK

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 / Average sunshine - Juneau, AK