August 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

Weather in August

August, the last month of the summer, in Juneau, is another cool month, with average temperature fluctuating between 44.6°F (7°C) and 54.1°F (12.3°C).

Temperature

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

Humidity

The average relative humidity in Juneau is 90%.

Rainfall

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

June through September are months without snowfall.

Ocean temperature

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

Daylight

In August, the average length of the day in Juneau is 15.3h.

Sunshine

The average sunshine in Juneau is 5.1h.

UV index

In August, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: In August, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. 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?

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

How much does it rain in Juneau in August?

In Juneau, Alaska, in August, it is raining for 21.6 days, with typically 7.56" (192mm) of accumulated precipitation.

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 in Juneau 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 Juneau, Alaska, the average length of the day in August is 15.3h.

How long on average sun shines in August in Juneau?

The average sunshine in August in Juneau is 5.1h.

What is the UV index intensity in August in Juneau?

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

Average temperature in August
Juneau, AK

Average temperature in August - Juneau, AK
  • Average high temperature in August: 12.3°C

The warmest month (with the highest average high temperature) is July (13.2°C).
Months with the lowest average high temperature are January and December (-3.5°C).

  • Average low temperature in August: 7°C

The month with the highest average low temperature is July (7.3°C).
The coldest month (with the lowest average low temperature) is February (-8.3°C).

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Average pressure in August
Juneau, AK

Average pressure in August - Juneau, AK
  • Average pressure in August: 1014.5mbar

The month with the highest atmospheric pressure is July (1016.8mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).

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Average wind speed in August
Juneau, AK

Average wind speed in August - Juneau, AK
  • Average wind speed in August: 6.8km/h

The windiest month (with the highest average wind speed) is January (11.1km/h).
The calmest month (with the lowest average wind speed) is June (5.9km/h).

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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: 192mm

The wettest month (with the highest rainfall) is October (251mm).
The driest month (with the least rainfall) is May (105mm).

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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: 0mm

The month with the highest snowfall is December (1595mm).
Months with the least snowfall are June, July, August and September (0mm).

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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).
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: 11.9°C

The best month for swimming (with the highest average sea temperature) is August (11.9°C).
The coldest month (with the lowest average sea temperature) is March (4.7°C).

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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: 15.3h

The month with the longest days is June (Average daylight: 18.2h).
The month with the shortest days is December (Average daylight: 6.5h).

  • Average sunshine in August: 5.1h

The month with the most sunshine is June (Average sunshine: 6.4h).
The month with the least sunshine is November (Average sunshine: 2.6h).

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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

Months with the highest UV index are May and July (UV index 3).
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

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: 7km

Months with the highest visibility are February, March, May, June, July, August, September, October and November (7km).
Months with the lowest visibility are January, April and December (6km).

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