September weather forecast and climate
Anchorage, AK

Wintertime in Anchorage, Alaska with mountains blanketed in snow
Wintertime in Anchorage, Alaska with mountains blanketed in snow

What is the temperature in September in Anchorage?

The average high-temperature, in September, is 55.6°F (13.1°C), while the average low-temperature is 41.2°F (5.1°C).

How many days does it rain in September in Anchorage?

In Anchorage, Alaska, in September, it is raining for 14.5 days, with typically 3" (75.7mm) of accumulated precipitation.

When does it start to snow in Anchorage?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.5" (12.7mm) of snow.

What is the water temperature in September in Anchorage?

In September, in Anchorage, the average sea temperature is 51.6°F (10.9°C). Swimming in 51.6°F (10.9°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.
Average temperature in September - Anchorage, AK
  • Average high temperature in September: 55.6°F

The warmest month (with the highest average high temperature) is July (65.4°F).
The month with the lowest average high temperature is January (22.7°F).

  • Average low temperature in September: 41.1°F

The month with the highest average low temperature is July (51.3°F).
The coldest month (with the lowest average low temperature) is January (11.4°F).

Average humidity in September - Anchorage, AK
  • Average humidity in September: 75.9%

Months with the highest relative humidity are November and December (77.1%).
The month with the lowest relative humidity is May (61.6%).

Average rainfall in September - Anchorage, AK
  • Average rainfall in September: 3"

The wettest month (with the highest rainfall) is August (3.3").
The driest month (with the lowest rainfall) is April (0.5").

Average rainfall days in September - Anchorage, AK
  • Average rainfall days in September: 14.5 days

The month with the highest number of rainy days is September (14.5 days).
The month with the lowest number of rainy days is April (5.5 days).

Average snowfall in September - Anchorage, AK
  • Average snowfall in September: 0.5"

The month with the highest snowfall is December (20.5").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in September - Anchorage, AK
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (10.5 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average sea temperature in September - Anchorage, AK
  • Average sea temperature in September: 51.6°F

The best month for swimming (with the highest average sea temperature) is August (53.1°F).
The coldest month (with the lowest average sea temperature) is February (35.8°F).

Average daylight in September / Average sunshine in September - Anchorage, AK
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 19.2h).
The month with shortest days is December (Average daylight: 5.6h).

  • Average sunshine in September: 5.3h

The month with most sunshine is May (Average sunshine: 9.3h).
The month with least sunshine is December (Average sunshine: 1.7h).

Average UV index in September - Anchorage, AK
  • Average UV index in September: 2

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

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