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Monthly climate in Juneau, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Juneau features a subarctic climate (Dfc).Temperatures typically range between -5 °C (23 °F) and 13 °C (56 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 27 °C (80 °F).The average annual precipitation amounts to about 2693 mm (106.0 inches) and receives 225 rainy days on the 1 mm (0.04 inches) threshold annually.Juneau enjoys an average of 1751 hours of sunshine throughout the year, and daylight varies from 6 hours 28 minutes to 18 hours 7 minutes per day.

Monthly average temperatures in Juneau, United States §

The warmest months in Juneau are June, July and August, with daily mean temperatures ranging from 11 to 13 °C (53 - 56 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -2 °C (23 - 28 °F) throughout the day. On average each year, Juneau experiences 0 days above 25 °C (77.0 °F) and 139 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Juneau, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 8°C
(47°F)		 9°C
(48°F)		 10°C
(51°F)		 12°C
(55°F)		 21°C
(70°F)		 25°C
(77°F)		 25°C
(77°F)		 27°C
(80°F)		 23°C
(74°F)		 14°C
(57°F)		 8°C
(47°F)		 10°C
(50°F)
Mean maximum 6°C
(43°F)		 4°C
(40°F)		 7°C
(44°F)		 10°C
(50°F)		 18°C
(65°F)		 22°C
(71°F)		 23°C
(74°F)		 24°C
(75°F)		 19°C
(67°F)		 12°C
(53°F)		 6°C
(44°F)		 7°C
(45°F)
Average high -2°C
(29°F)		 -2°C
(28°F)		 1°C
(34°F)		 5°C
(41°F)		 11°C
(52°F)		 14°C
(58°F)		 16°C
(61°F)		 16°C
(61°F)		 13°C
(56°F)		 6°C
(44°F)		 1°C
(35°F)		 -0°C
(32°F)
Daily mean -4°C
(25°F)		 -5°C
(23°F)		 -1°C
(30°F)		 2°C
(36°F)		 7°C
(45°F)		 11°C
(53°F)		 13°C
(56°F)		 13°C
(56°F)		 10°C
(50°F)		 4°C
(40°F)		 -1°C
(31°F)		 -2°C
(28°F)
Average low -6°C
(21°F)		 -8°C
(18°F)		 -4°C
(25°F)		 -1°C
(30°F)		 4°C
(39°F)		 8°C
(47°F)		 11°C
(51°F)		 10°C
(51°F)		 7°C
(44°F)		 2°C
(35°F)		 -3°C
(26°F)		 -5°C
(24°F)
Mean minimum -21°C
(-6°F)		 -18°C
(-0°F)		 -15°C
(6°F)		 -8°C
(18°F)		 -2°C
(29°F)		 5°C
(41°F)		 8°C
(46°F)		 6°C
(43°F)		 0°C
(33°F)		 -6°C
(21°F)		 -12°C
(11°F)		 -15°C
(6°F)
Minimum -25°C
(-13°F)		 -24°C
(-12°F)		 -18°C
(0°F)		 -13°C
(9°F)		 -3°C
(26°F)		 2°C
(36°F)		 7°C
(45°F)		 4°C
(40°F)		 -4°C
(26°F)		 -11°C
(13°F)		 -15°C
(6°F)		 -24°C
(-10°F)

Compare climate in Juneau with other places

Compare temperature, precipitation, sunshine, UV index in Juneau, United States with other places around the world.

Monthly average precipitation in Juneau, United States §

Juneau usually has the most precipitation in August, October and December, with an average of 21 rainy days and 301 mm (11.9 inches) of precipitation per month.The driest months in Juneau are April, May and July. On average, 167 mm (6.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Juneau, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 215 (8.4) 182 (7.2) 175 (6.9) 163 (6.4) 174 (6.9) 189 (7.4) 164 (6.5) 280 (11.0) 259 (10.2) 332 (13.1) 267 (10.5) 292 (11.5)
Average precipitation days (≥ 1 mm) 16 14 17 17 18 22 18 20 17 22 22 22

Monthly sunshine hours in Juneau, United States §

The sunniest months in Juneau are April, May and June, when the sun shines an average of 7 hours 11 minutes a day.Least sunny months in Juneau: January, November and December receive an average of 1 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Juneau, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 42 125 179 218 235 201 198 177 167 103 57 45
Mean daily daylight hours 7h 13m 9h 23m 11h 54m 14h 29m 16h 50m 18h 7m 17h 23m 15h 13m 12h 42m 10h 9m 7h 47m 6h 28m

Solar UV radiation in Juneau, United States §

Juneau experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Juneau UV Index data.

Average daily maximum UV levels by month for Juneau, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 2 4 5 8 8 9 9 6 3 1 1