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

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
August, the last month of the summer, in Juneau, is also a fresh month, with average temperature fluctuating between 54.1°F (12.3°C) and 48.9°F (9.4°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). In Juneau, the average low-temperature is 48.9°F (9.4°C).

Humidity

In August, the average relative humidity 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

In Juneau, Alaska, 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

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

Sunshine

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

UV index

In August, the average daily maximum UV index in Juneau is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for the average person.
Note: In August, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

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 48.9°F (9.4°C).

What is the average humidity in August in Juneau?

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

How many days does it rain in August in Juneau?

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

When it does not snow in Juneau?

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

What is the month with the warmest ocean in Juneau?

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

How cold is the water in August in Juneau?

In August, the average ocean temperature 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?

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

How long on average sun shines in August in Juneau?

The average sunshine in August is 5.1h.

What is the UV index intensity in August in Juneau?

The average daily maximum UV index in August is 2. A UV Index estimate of 2, and below, represents a low health threat from the exposure to the Sun's UV rays.
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).
Months with the lowest average high temperature are January and December (25.7°F).

  • Average low temperature in August: 49°F

The month with the highest average low temperature is July (50°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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%).

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 lowest rainfall) is May (4.13").

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 lowest number of rainy days is February (4.8 days).

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

The month with the highest snowfall is December (62.8").
Months with the lowest snowfall are June, July, August and September (0").

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 lowest number of snowfall days are June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 6.5h).

  • Average sunshine in August: 5.1h

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

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).