Alaska weather in September 2025

Expect 13°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Alaska in September. Check more long-term weather averages for Alaska in September before you book your next holiday to Alaska in 2025/2026.

  • 13°C maximum daytime temperature in September in Alaska (Anchorage)13
    13°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in September in Alaska (Anchorage)14
    14 days with some rainfall
  • 5°C minimum night-time temperature in September in Alaska (Anchorage)5
    5°C min night temperature
  • 13 hours of daylight per day in September in Alaska (Anchorage)13
    13 hours of daylight per day
  • No heat & humidity in September in Alaska (Anchorage)0
    No heat & humidity
  • 68 mm monthly rainfall in September in Alaska (Anchorage)68
    68 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Alaska (Anchorage)2
    2 (Low) UV index
  • 12°C sea temperature in September in Alaska (Anchorage)12
    12°C sea temperature

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The September weather guide for Alaska (Anchorage) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Alaska destinations

Below are average maximum temperatures at popular countries, regions and places in Alaska in September. Select a holiday destination to see more weather parameters.

All Alaska destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How warm is it in Alaska in September?

Daytime temperatures usually reach 13°C in Anchorage, Alaska in September, falling to 5°C at night.

How sunny is it in Alaska in September?

There are normally 5 hours of bright sunshine each day in Anchorage, Alaska in September - that's 41% of daylight hours.

How warm is the sea around Alaska in September?

The average sea temperature around Anchorage, Alaska in September is 12°C.

Does it rain in Alaska in September?

There are usually 14 days with some rain in Anchorage, Alaska in September and the average monthly rainfall is 68mm.

Alaska September sunrise & sunset times

Browse the sunrise and sunset times for Alaska in September 2025. Select a month to view Alaska sunrise and sunset times for the next 12 months. The Alaska sunrise and sunset times shown below are for Anchorage.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 20:04
Monday, 15th September 2025 06:28 19:20
Tuesday, 30th September 2025 07:05 18:32

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