Juneau, AK Climate & Monthly Averages
The climate of Juneau
Cold is the baseline in Juneau, not the exception. Night-time lows sit at or below freezing in 5 months of the year, and the warmest month, July, still only averages 64°F (18°C) by day. February runs to 24°F (-5°C) after dark.
Climate quick facts
- Hottest month: July - highs near 64°F (18°C)
- Coldest month: February - highs near 31°F (0°C)
- Decade extremes (2015-2024): 84°F (29°C) high · -9°F (-23°C) low
- Wettest month: September (21 rainy days) · Sunniest: May (9.4 h sun/day)
- Climate type: oceanic
- Annual swing: 17°C between the average warmest and coolest month · day to night: 5°C
- Snow: about 98 days a year
- Months with freezing average lows: 5
- Average humidity: 80%
Temperatures through the year
February is the coolest month, with highs of 31°F (0°C) and lows near 24°F (-5°C). July is the warm end of the year, averaging 64°F (18°C) by day and 54°F (12°C) overnight. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 84°F (29°C) and the lowest daily minimum -9°F (-23°C). Sunshine averages 5.7 hours a day over the year - duller than almost anywhere else we cover, peaking in May at 9.4 hours.
Rain, sun and snow
The wettest month is September (15.5 inches (393 mm) across 21 days) and the driest June. Days and nights are about 5°C apart on average - narrower than all but 3% of the 3496 cities in our dataset. Snow falls on roughly 98 days a year, mostly October through May. When it does rain it rains hard - about 14.1 mm on an average wet day, against roughly 6 mm for a typical temperate city.
How Juneau compares
- Annual precipitation is 128.7 inches (3268 mm) - wetter than any other city in our 3496-city dataset.
- Juneau averages 42°F (5°C) across the year - cooler than almost every other city we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 32° | 25° | 20 | 12.7 in | 2.2 h/day | 7.1 h | 65% | 77% |
| February | 31° | 24° | 17 | 8.4 in | 4.2 h/day | 9.2 h | 60% | 74% |
| March | 36° | 28° | 18 | 7.4 in | 6.0 h/day | 11.6 h | 59% | 74% |
| April | 43° | 33° | 18 | 7.6 in | 7.4 h/day | 14.3 h | 62% | 78% |
| May | 54° | 41° | 16 | 7.4 in | 9.4 h/day | 16.7 h | 51% | 79% |
| June | 61° | 50° | 19 | 6.6 in | 9.4 h/day | 18.2 h | 63% | 82% |
| July | 64° | 54° | 18 | 9.9 in | 8.5 h/day | 17.6 h | 59% | 86% |
| August | 63° | 53° | 19 | 13.8 in | 7.8 h/day | 15.4 h | 63% | 87% |
| September | 56° | 47° | 21 | 15.5 in | 5.8 h/day | 12.7 h | 70% | 86% |
| October | 46° | 38° | 21 | 14.9 in | 4.0 h/day | 10.1 h | 68% | 84% |
| November | 36° | 29° | 22 | 11.9 in | 2.3 h/day | 7.7 h | 72% | 79% |
| December | 32° | 25° | 22 | 12.6 in | 1.6 h/day | 6.4 h | 70% | 79% |
Juneau month by month
Average high and low for each month, with the bar showing where it sits in Juneau's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 20 days
- Sunshine
- 2.2 h
- Daylight
- 7.1 h
- Snow
- 17 days
February
- Rain
- 17 days
- Sunshine
- 4.2 h
- Daylight
- 9.2 h
- Snow
- 14 days
March
- Rain
- 18 days
- Sunshine
- 6.0 h
- Daylight
- 11.6 h
- Snow
- 15 days
April
- Rain
- 18 days
- Sunshine
- 7.4 h
- Daylight
- 14.3 h
- Snow
- 11 days
May
- Rain
- 16 days
- Sunshine
- 9.4 h
- Daylight
- 16.7 h
- Snow
- 1 day
June
- Rain
- 19 days
- Sunshine
- 9.4 h
- Daylight
- 18.2 h
July
- Rain
- 18 days
- Sunshine
- 8.5 h
- Daylight
- 17.6 h
August
- Rain
- 19 days
- Sunshine
- 7.8 h
- Daylight
- 15.4 h
September
- Rain
- 21 days
- Sunshine
- 5.8 h
- Daylight
- 12.7 h
October
- Rain
- 21 days
- Sunshine
- 4.0 h
- Daylight
- 10.1 h
- Snow
- 5 days
November
- Rain
- 22 days
- Sunshine
- 2.3 h
- Daylight
- 7.7 h
- Snow
- 15 days
December
- Rain
- 22 days
- Sunshine
- 1.6 h
- Daylight
- 6.4 h
- Snow
- 18 days
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Juneau
Spring (March through May)
Spring in Juneau runs cold, with daytime highs averaging 44°F (7°C) and nights around 34°F (1°C); rain falls on around 52 of the 90 days, plus about 27 snowy days.
Summer (June through August)
Summer is crisp but comfortable here - highs near 63°F (17°C), nights near 52°F (11°C), and rain falls on around 57 of the 90 days.
Fall (September through November)
Fall runs cold here - highs near 46°F (8°C), nights near 38°F (3°C), and rain falls on around 64 of the 90 days, plus about 21 snowy days.
Winter (December through February)
Winter in Juneau runs to hard cold, with daytime highs averaging 32°F (0°C) and nights around 25°F (-4°C); rain falls on around 59 of the 90 days, plus about 50 snowy days. Sun is scarce, averaging 2.7 hours a day. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Climate questions, answered
Is Juneau a wet city?
How much sun does Juneau get?
What should I wear in Juneau?
How often does it rain in Juneau?
Are nights cold in Juneau?
Is Juneau warmer or cooler than most cities?
Best time to visit Juneau
Aim for May to August if you get the choice: these are the warmest and brightest weeks of the year, and highs average 60°F (16°C) against roughly 18 wet days a month. For the same question asked the other way round, see where else is warm in May.
Pack for Juneau with a heavy insulated coat, hat and gloves for winter and proper waterproofs rather than an umbrella - wet days are the norm here. July nights average 54°F (12°C), so evenings rarely match the afternoons.
Juneau temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.