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

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
  • The average high temperature in September: 13.1°C

The warmest month (with the highest average high temperature) is July (18.6°C).
The month with the lowest average high temperature is January (-5.2°C).

  • The average low temperature in September: 5.1°C

The month with the highest average low temperature is July (10.7°C).
The coldest month (with the lowest average low temperature) is January (-11.4°C).

  • The 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%).

  • The average rainfall in September: 75.7mm

The wettest month (with the highest rainfall) is August (82.6mm).
The driest month (with the lowest rainfall) is April (11.9mm).

  • The 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).

  • The average snowfall in September: 12.7mm

The month with the highest snowfall is December (520.7mm).
Months with the lowest snowfall are June, July and August (0mm).

  • The 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).

  • The average sea temperature in September: 11°C

Best months for swimming (with the highest average sea temperature) are August and September (11°C).
Coldest months (with the lowest average sea temperature) are February, March and April (4°C).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 19h).
The month with shortest days is December (Average daylight: 6h).

  • The 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).

  • The 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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