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Climate in Juneau, Alaska: Monthly Weather Averages

By the AverageClimate Editorial Team · Last updated: October 2026

Juneau sits at 16 feet above sea level, and its climate, as recorded at the Juneau International Airport, AK station, runs to a yearly mean of 42.1°F. The warmest month is July, averaging 57.0°F with typical highs of 64.0°F; the coldest is January, averaging 28.5°F with lows around 23.8°F. Across a normal year the city receives 67.0 in of precipitation and 87.6 in of snow. The full month-by-month picture below comes from the official 1991–2020 U.S. Climate Normals — the 30-year averages the National Weather Service itself uses — so it describes the Juneau climate you should actually plan around, whether you are timing a visit, weighing a move, or just settling an argument about which month is best.

Juneau climate month by month

The table below is the complete 1991–2020 normals profile for Juneau: average high, average low and mean temperature, rainfall, and snowfall for every month. Read down the Mean column to feel the year's rhythm — Juneau's temperature range runs from 28.5°F in January to 57.0°F in July.

How to read the colors:below freezingcoldcoolmildwarmhot. Bands are colored by each cell's own temperature, so a whole year reads at a glance.

Juneau through the seasons

Winter in Juneau averages highs of 33.1–35.7°F and lows of 23.8–25.9°F, a seasonal mean of 29.6°F. The three months together bring 16.9 in of precipitation — about 25% of the city's yearly total — with December the wettest of the three at 6.53 in. Snowfall averages 59.3 in over the season, most of it in January (24.5 in). Average temperatures sit below freezing, so this is the heart of the heating season: expect snow-covered ground, icy mornings, and short, cold days as the local norm rather than the exception.

Spring in Juneau averages highs of 39.2–57.6°F and lows of 26.6–40.3°F, a seasonal mean of 40.9°F. The three months together bring 10.7 in of precipitation — about 16% of the city's yearly total — with March the wettest of the three at 3.67 in. Snowfall averages 13.6 in over the season, most of it in March (12.4 in). The season is a transition: the average temperature climbs 16.1°F from March to May, and by late spring Juneau is firmly into mild territory, with May rainfall of 3.51 in to plan around.

Summer in Juneau averages highs of 62.4–64.0°F and lows of 46.8–50.1°F, a seasonal mean of 55.9°F. The three months together bring 15.4 in of precipitation — about 23% of the city's yearly total — with August the wettest of the three at 6.41 in. Summer is the mildest in the country by big-city standards — heat waves happen, but the average afternoon stays in the 70s, and many homes historically get by without air conditioning.

Fall in Juneau averages highs of 38.3–56.1°F and lows of 29.2–44.1°F, a seasonal mean of 42.0°F. The three months together bring 24.1 in of precipitation — about 36% of the city's yearly total — with September the wettest of the three at 9.15 in. Snowfall averages 14.7 in over the season, most of it in November (13.8 in). Temperatures ease off through the season — the monthly mean drops 16.3°F from September to November — and fall is when Juneau's weather turns cooler and wetter, with the first freezes arriving by November.

Best and worst months to visit Juneau

Ranking every month by its normals — mild mean temperatures score best, heavy rain and snow count against — the most comfortable months to visit Juneau are:

JuneJulyAugust

June leads the list: average highs of 62.4°F, lows of 46.8°F, and 3.82 in of rain, with snow a non-factor at 0.0 in. The other picks, July and August, offer the same balance in Juneau's mild stretch of the year. At the other end, January is usually the month to avoid — deep-winter cold, with a mean temperature of 28.5°F and 6.02 in of precipitation plus 24.5 in of snow.

How Juneau compares

Across the 114 cities in our dataset, the typical city averages 57.8°F for the year and 35.7 in of precipitation. Juneau runs 15.7°F cooler than that typical city and wetter by 31.3 in a year, ranking #111 of 114 for annual warmth and #4 of 114 for precipitation (wettest first). Its year-round temperature swing — warmest month minus coldest — is 28.5°F, which puts it in the moderate, clearly seasonal camp.

Planning notes for Juneau

For anyone relocating: average overnight lows drop below freezing in 5 months (January, February, March, November, December), so heating, winter tires, and pipe protection are real seasonal concerns; even the warmest month's average high stays below 80°F, so summer heat is rarely a planning factor; days and nights differ by only 12.5°F on average, a sign of strong water or coastal moderation; 2 months of the year average between 55°F and 80°F, the band most people find comfortable without heating or cooling. Those four facts, all straight from the normals table above, shape everything from a Juneau wardrobe to its utility bills.

Juneau climate FAQ

Source: 1991–2020 U.S. Climate Normals, NOAA National Centers for Environmental Information (NCEI) — ncei.noaa.gov. Station: Juneau International Airport, AK (USW00025309), elevation 16 ft. Figures checked October 2026.