Juneau weather in September 2025

Expect 12°C 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.

  • 12°C maximum daytime temperature in September in Juneau12
    12°C max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in September in Juneau19
    19 days with some rainfall
  • 4°C minimum night-time temperature in September in Juneau4
    4°C 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
  • 210 mm monthly rainfall in September in Juneau210
    210 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Juneau3
    3 (Moderate) UV index
  • 10°C sea temperature in September in Juneau10
    10°C 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 / mm)  |  Imperial (°F / inches)

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How warm is it in Juneau in September?

Daytime temperatures usually reach 12°C in Juneau in September, falling to 4°C 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.

Is the sea cold around Juneau in September?

The average sea temperature around Juneau in September is 10°C.

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 210mm.

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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