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

More about Juneau

Juneau by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Alaska

  • Save 10% on hotels with Hopper rewards programme
  • Book stays in Las Vegas, New York, Tampa & beyond
  • Sign up to Hopper rewards programme for discount

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)

Back to top

More about the USA

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^