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 temperature in the range of an average low of 44.6°F (7°C) and an average high of 54.1°F (12.3°C).

Temperature

In Juneau, the average high-temperature in August is relatively 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

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

Rainfall

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

Snowfall

June through September are months without snowfall.

Ocean temperature

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

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

Sunshine

The average sunshine in August in Juneau, Alaska, 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 hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in August interpret into the following advice:
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.
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FAQ

What is the temperature in August in Juneau?

In Juneau, Alaska, in August, the average high-temperature is 54.1°F (12.3°C), and the average low-temperature is 44.6°F (7°C).

What is the average humidity in August in Juneau?

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

How many days does it rain in August in Juneau?

In Juneau, Alaska, during August, the rain falls for 21.6 days and regularly aggregates up to 7.56" (192mm) of precipitation.

When it does not snow in Juneau?

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

What month is the ocean warmest 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 Juneau, Alaska, the average seawater temperature in August is 53.4°F (11.9°C). Swimming in 53.4°F (11.9°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 August?

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

When are sunrise and 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, in Juneau, Alaska, 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, Alaska, the average sunshine duration in August is 5.1h.

How high is the UV index in August in Juneau?

In Juneau, Alaska, the average daily maximum UV index in August is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
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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