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.
| 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 |
| 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.
| 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.
| 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.