Juneau weather in September 2025

Expect 54°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Juneau in September. Check more long-term weather averages for Juneau in September before you book your next holiday to Alaska in 2025/2026.

  • 54°F maximum daytime temperature in September in Juneau54
    54°F max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in September in Juneau19
    19 days with some rainfall
  • 39°F minimum night-time temperature in September in Juneau39
    39°F min night temperature
  • 13 hours of daylight per day in September in Juneau13
    13 hours of daylight per day
  • No heat & humidity in September in Juneau0
    No heat & humidity
  • 8.3 inches monthly rainfall in September in Juneau8.3
    8.3 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Juneau3
    3 (Moderate) UV index
  • 50°F sea temperature in September in Juneau50
    50°F sea temperature

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The September weather guide for Alaska (Juneau) 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.

Metric (°C)  |  Imperial (°F)

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More about the USA

How warm is it in Juneau in September?

Daytime temperatures usually reach 54°F in Juneau in September, falling to 39°F at night.

How sunny is it in Juneau in September?

There are normally 4 hours of bright sunshine each day in Juneau in September - that's 28% of daylight hours.

How warm is the sea around Juneau in September?

The average sea temperature around Juneau in September is 50°F.

Does it rain in Juneau in September?

There are usually 19 days with some rain in Juneau in September and the average monthly rainfall is 8.3 inches.

Juneau September sunrise & sunset times

Browse the sunrise and sunset times for Juneau in September 2025. Select a month to view Juneau sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 04:58 18:56
Monday, 15th September 2025 05:28 18:16
Tuesday, 30th September 2025 06:01 17:33

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