September 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
September, the first month of the autumn, in Juneau, is still a mild month, with average temperature fluctuating between 55.8°F (13.2°C) and 44.4°F (6.9°C).

Temperature

The average high-temperature, in September, is 55.8°F (13.2°C), while the average low-temperature is 44.4°F (6.9°C).

Humidity

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

Rainfall

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

Snowfall

In Juneau, Alaska, it doesn't snow. In October, it regularly snows. Throughout the year, 86.7" (2202mm) of snow is accumulated.

Ocean temperature

In September, the average ocean temperature in Juneau is 50.9°F (10.5°C). 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 is 12.8h.

Sunshine

The average sunshine in Juneau, Alaska, is 3.7h.

UV index

In Juneau, Alaska, the average UV index in September is 3.

What is the temperature in September in Juneau?

In Juneau, Alaska, in September, the average high-temperature is 55.8°F (13.2°C), and the average low-temperature is 44.4°F (6.9°C).

What is the most humid month in Juneau?

With an average relative humidity of 87.9%, September is the most humid month.

What is the average humidity in September in Juneau?

In September, the average relative humidity is 87.9%.

How many days does it rain in September in Juneau?

In Juneau, during September, the rain falls for 22.4 days and regularly aggregates up to 8.6" (219.5mm) of precipitation.

What is the rainiest month in Juneau?

September is the month with the most rainfall in Juneau, Alaska. Rain falls for 22.4 days and accumulates 8.6" (219.5mm) of precipitation.

Does it snow in Juneau in September?

In Juneau, in September, it doesn't snow. In October, it regularly snows.

What is the water temperature in September in Juneau?

In Juneau, the average seawater temperature in September is 50.9°F (10.5°C). 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.

What is the average length of the day in September in Juneau?

In Juneau, Alaska, the average length of the day in September is 12.8h.

How long on average sun shines in September in Juneau?

The average sunshine in September is 3.7h.

What is the UV index reading in September in Juneau?

In September, the average UV index in Juneau is 3.
Average temperature in September - Juneau, AK
  • Average high temperature in September: 55.7°F

The warmest month (with the highest average high temperature) is July (63.9°F).
The month with the lowest average high temperature is January (32.8°F).

  • Average low temperature in September: 44.4°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 September - Juneau, AK
  • Average humidity in September: 87.9%

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

Average rainfall in September - Juneau, AK
  • Average rainfall in September: 8.6"

Wettest months (with the highest rainfall) are September and October (8.6").
The driest month (with the lowest rainfall) is April (2.9").

Average rainfall days in September - Juneau, AK
  • Average rainfall days in September: 22.4 days

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

The month with the highest snowfall is January (27.7").
Months with the lowest snowfall are May, June, July, August and September (0").

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

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 in September - Juneau, AK
  • Average sea temperature in September: 50.9°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 September / Average sunshine in September - Juneau, AK
  • Average daylight in September: 12.8h

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 September: 3.7h

The month with most sunshine is May (Average sunshine: 7.5h).
The month with least sunshine is December (Average sunshine: 1.3h).

Average UV index in September - Juneau, AK
  • Average UV index in September: 3

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, November and December (UV index 0).

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