August 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 August

August, the last month of the summer in Juneau, is also a fresh month, with an average temperature varying between 44.6°F (7°C) and 54.1°F (12.3°C).

Temperature

In August, the average high-temperature is almost the same as in July - a fresh 54.1°F (12.3°C). In August, the average low-temperature is 44.6°F (7°C).

Humidity

The average relative humidity in August is 90%.

Rainfall

In August, in Juneau, Alaska, the rain falls for 21.6 days. Throughout August, 7.56" (192mm) of precipitation is accumulated. Throughout the year, there are 172.4 rainfall days, and 85.87" (2181mm) of precipitation is accumulated.

Snowfall

In Juneau, snow does not fall in June through September.

Ocean temperature

With an average ocean temperature of 53.4°F (11.9°C), August is the month with the warmest seawater in Juneau.
Note: 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.

Daylight

The average length of the day in August in Juneau is 15h and 17min.
On the first day of the month, sunrise is at 4:50 am and sunset at 9:17 pm. On the last day of August, in Juneau, sunrise is at 5:55 am and sunset at 7:59 pm AKDT.

Sunshine

In August, the average sunshine in Juneau is 5.1h.

UV index

In August, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In August, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. 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.
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FAQ

What is the average humidity in August in Juneau?

In Juneau, Alaska, the average relative humidity in August is 90%.

How much does it rain in Juneau in August?

In August, in Juneau, Alaska, the rain falls for 21.6 days. Throughout August, 7.56" (192mm) of precipitation is accumulated.

When it does not snow in Juneau?

June through September are months without snowfall.

What is the month with the warmest ocean in Juneau?

The month with the warmest seawater is August, with an average ocean temperature of 53.4°F (11.9°C).

What is the ocean temperature in August in Juneau?

In August, the average ocean temperature in Juneau, Alaska, is 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.

How many hours of daylight does Juneau have in August?

In August, the average day length in Juneau, Alaska, is 15h and 17min.

When is the sunrise / sunset in August in Juneau?

In August, on the first day of the month, sunrise is at 4:50 am and sunset at 9:17 pm. On the last day of the month, sunrise is at 5:55 am and sunset at 7:59 pm AKDT.

How many hours of sunshine does Juneau have in August?

In Juneau, the average sunshine duration in August is 5.1h.

What is the UV index reading in August in Juneau?

The average daily maximum UV index in August in Juneau is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Juneau, AK

Average temperature in August - Juneau, AK
  • Average high temperature in August: 54.1°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 August: 44.6°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 August
Juneau, AK

Average pressure in August - Juneau, AK
  • Average pressure in August: 29.96"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 August
Juneau, AK

Average wind speed in August - Juneau, AK
  • Average wind speed in August: 4.2mph

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 August
Juneau, AK

Average humidity in August - Juneau, AK
  • Average humidity in August: 90%

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 August
Juneau, AK

Average rainfall in August - Juneau, AK
  • Average rainfall in August: 7.56"

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 August
Juneau, AK

Average rainfall days in August - Juneau, AK
  • Average rainfall days in August: 21.6 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 August
Juneau, AK

Average snowfall in August - Juneau, AK
  • Average snowfall in August: 0"

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 August
Juneau, AK

Average snowfall days in August - Juneau, AK
  • Average snowfall days in August: 0 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 August
Juneau, AK

Average sea temperature in August - Juneau, AK
  • Average sea temperature in August: 53.5°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 August /
Average sunshine in August
Juneau, AK

Average daylight in August / Average sunshine in August - Juneau, AK
  • Average daylight in August: 15h 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 August: 5h and 6min

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 August
Juneau, AK

Average sunshine days in August - Juneau, AK
  • Average sunshine days in August: 7.3 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 August
Juneau, AK

Average UV index in August - Juneau, AK
  • Average UV index in August: 2

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 August
Juneau, AK

Average cloud cover in August - Juneau, AK
  • Average cloud cover in August: 70

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 August
Juneau, AK

Average visibility in August - Juneau, AK
  • Average visibility in August: 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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