Juneau weather in August 2026

Q: How warm is it in Juneau in August?

Daytime temperatures usually reach 17°C in Juneau in August, falling to 9°C at night.

Q: How sunny is it in Juneau in August?

There are normally 7 hours of bright sunshine each day in Juneau in August - that's 41% of daylight hours.

Q: How warm is the sea around Juneau in August?

The average sea temperature around Juneau in August is 14°C.

Q: Does it rain in Juneau in August?

There are usually 14 days with some rain in Juneau in August and the average monthly rainfall is 64mm.

Expect daytime maximum temperatures of 15°C in Juneau, Alaska in August based on long-term weather averages. There are 5 hours of sunshine per day on average with 17 days with some rainfall and typically 157 mm of rainfall in the month.

15
15°C max day temperature
5
5 hours of sunshine per day
17
17 days with some rainfall
6
6°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
157
157 mm of monthly rainfall
4
4 (Moderate) UV index
13
13°C sea temperature

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The August 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.