Juneau Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Juneau, Alaska during each month of the year.

The average high and low temperatures are listed below monthly and annually for Juneau, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 50, 60 or 70 °F each month in Juneau, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Juneau, 2010 to 2019
High °F Low °F   High °C Low °C
35 27 January 2 -3
36 24 February 2 -4
40 27 March 4 -3
49 33 April 9 1
58 41 May 15 5
62 48 June 17 9
64 51 July 18 11
63 50 August 17 10
57 44 September 14 7
48 37 October 9 3
38 29 November 3 -2
34 26 December 1 -3
49 37 Year 9 3
30-year temperature averages for Juneau, 1991 to 2020
High °F Low °F   High °C Low °C
33 24 January 1 -5
36 25 February 2 -4
39 27 March 4 -3
49 33 April 9 0
58 40 May 14 5
62 47 June 17 8
64 50 July 18 10
63 49 August 17 10
56 44 September 13 7
47 37 October 9 3
38 29 November 4 -2
35 26 December 2 -3
48 36 Year 9 2

Days of Warm Weather in Juneau

A warm summer day in Juneau means temperatures in the 70s Fahrenheit. The city normally sees 21 days a year above 69 degrees, which show up sporadically from May until September. Just twice a year on average, a day here heats up to 80 °F.

Days per month in Juneau of at least 50, 60 or 70 °F
  50 °F
10 °C
60 °F
16 °C
70 °F
21 °C
January 0 0 0
February 0 0 0
March 1 0 0
April 13 2 0
May 26 12 3
June 30 18 5
July 31 22 7
August 31 19 6
September 28 7 1
October 9 0 0
November 1 0 0
December 0 0 0
Year 171 80 21

How Often Juneau Has Cold Temperatures

Freezing temperatures can happen in Juneau anytime from September until May. Juneau typically sees 128 frosty nights a year. The coldest nights drop down to below 0 °F (-18 °C), which happens on average twice a year.

For an average of 39 days annually the thermometer never rises above freezing. Days that chilly usually show up during November to March.

Days in Juneau with a minimum temperature that drops to 32, 20 and 10 °F or lower
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 5 10 23
February 3 9 21
March 1 6 22
April 0 1 13
May 0 0 2
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 1
October 0 0 8
November 1 5 17
December 3 8 21
Year 13 40 128
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Alaska Temperatures
Back to Top