September weather forecast
Anchorage, AK

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

Weather in September

September, the first month of the autumn in Anchorage, is also a fresh month, with temperature in the range of an average low of 43.9°F (6.6°C) and an average high of 52.7°F (11.5°C).

Temperature

In September, the average high-temperature slightly decreases from a moderate 59.5°F (15.3°C) in August to a cool 52.7°F (11.5°C). In September, in Anchorage, the average low-temperature is 43.9°F (6.6°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

The month with the most rainfall in Anchorage is September, when the rain falls for 16 days and typically aggregates up to 1.93" (49mm) of precipitation.

Snowfall

Months with snowfall in Anchorage are January through May, September through December. September is the first month it typically snows in Anchorage. Throughout September, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow. In Anchorage, during the entire year, snow falls for 59.3 days and aggregates up to 23.5" (597mm) of snow.

Ocean temperature

In September, the average ocean temperature in Anchorage is 51.6°F (10.9°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 September, the average length of the day in Anchorage, Alaska, is 12h and 52min.
On the first day of September in Anchorage, sunrise is at 6:52 am and sunset at 9:06 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 7:34 pm AKDT.

Sunshine

In September, the average sunshine in Anchorage is 7.6h.

UV index

The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 2 translate into the following recommendations:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the average humidity in September in Anchorage?

The average relative humidity in September in Anchorage is 78%.

What is the rainiest month in Anchorage?

September is the month with the most rainfall. Rain falls for 16 days and accumulates 1.93" (49mm) of precipitation.

How many days does it rain in September in Anchorage?

In Anchorage, Alaska, in September, during 16 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

When does it start snowing in Anchorage?

September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow.

What is the water temperature in September in Anchorage?

In Anchorage, in September, the average water 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.

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

The average day length in September in Anchorage, Alaska, is 12h and 52min.

When are sunrise and sunset in September in Anchorage?

In September, on the first day of the month, sunrise is at 6:52 am and sunset at 9:06 pm. On the last day of the month, in Anchorage, sunrise is at 8:04 am and sunset at 7:34 pm AKDT.

How many hours of sunshine does Anchorage have in September?

In September, the average sunshine duration in Anchorage, Alaska, is 7.6h.

How high is the UV index in September in Anchorage?

In September, the average daily maximum UV index in Anchorage is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Anchorage, AK

Average temperature in September - Anchorage, AK
  • Average high temperature in September: 52.7°F

The warmest month (with the highest average high temperature) is July (61.9°F).
The month with the lowest average high temperature is January (20.3°F).

  • Average low temperature in September: 43.9°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 (13.1°F).

[Resources]

Average pressure in September
Anchorage, AK

Average pressure in September - Anchorage, AK
  • Average pressure in September: 29.74"Hg

The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.67"Hg).

[Resources]

Average wind speed in September
Anchorage, AK

Average wind speed in September - Anchorage, AK
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).

[Resources]

Average humidity in September
Anchorage, AK

Average humidity in September - Anchorage, AK
  • Average humidity in September: 78%

The months with the highest relative humidity are January, February and March (86%).
The month with the lowest relative humidity is May (68%).

[Resources]

Average rainfall in September
Anchorage, AK

Average rainfall in September - Anchorage, AK
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is September (1.93").
The driest month (with the least rainfall) is May (0.55").

[Resources]

Average rainfall days in September
Anchorage, AK

Average rainfall days in September - Anchorage, AK
  • Average rainfall days in September: 16 days

The month with the highest number of rainy days is August (17.9 days).
The month with the least rainy days is February (7 days).

[Resources]

Average snowfall in September
Anchorage, AK

Average snowfall in September - Anchorage, AK
  • Average snowfall in September: 0.08"

The month with the highest snowfall is December (5.51").
The months with the least snowfall are June, July and August (0").

[Resources]

Average snowfall days in September
Anchorage, AK

Average snowfall days in September - Anchorage, AK
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (11.6 days).
The months with the least snowfall days are June, July and August (0 days).

[Resources]

Average sea temperature in September
Anchorage, AK

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).

[Resources]

Average daylight in September /
Average sunshine in September
Anchorage, AK

Average daylight in September / Average sunshine in September - Anchorage, AK
  • Average daylight in September: 12h and 52min

The month with the longest days is June (Average daylight: 19h and 13min).
The month with the shortest days is December (Average daylight: 5h and 38min).

  • Average sunshine in September: 7h and 36min

The months with the most sunshine are May and June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).

[Resources]

Average sunshine days in September
Anchorage, AK

Average sunshine days in September - Anchorage, AK
  • Average sunshine days in September: 11.1 days

The month with the most sunshine days is January (16.9 days).
The month with the least sunshine days is September (11.1 days).

[Resources]

Average UV index in September
Anchorage, AK

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

The months with the highest UV index are June and July (UV index 4).
The month with the lowest UV index is February (UV index 1).

[Resources]

Average cloud cover in September
Anchorage, AK

Average cloud cover in September - Anchorage, AK
  • Average cloud cover in September: 44

The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is May (Cloud cover 38).

[Resources]

Average visibility in September
Anchorage, AK

Average visibility in September - Anchorage, AK
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is March (5mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location