Juneau weather by month
What a typical year looks like in Juneau, Alaska: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Juneau Airport, 22 km from Juneau; records cover 1943–2026.
The year at a glance
- Precipitation a year
- 67 in1702 mm
- Snow a year
- 88 in223 cm
- Last spring freeze
- May 8
- First fall freeze
- Sep 29
- Heating degree days
- 8,337
- Cooling degree days
- 2
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 78°26° (cooling, 1%).
Month by month
Juneau in January
Highs average 33°1° and lows 24°−5°, with 6 in153 mm of precipitation and 25 in62 cm of snow in a typical January.
- Record high
- 57°14° (1958)
- Record low
- −22°−30° (1972)
- Heating degree days
- 1133
- Cooling degree days
- 0
Juneau in February
Highs average 36°2° and lows 25°−4°, with 4.3 in109 mm of precipitation and 17 in42 cm of snow in a typical February.
- Record high
- 57°14° (1992)
- Record low
- −22°−30° (1968)
- Heating degree days
- 976
- Cooling degree days
- 0
Juneau in March
Highs average 39°4° and lows 27°−3°, with 3.7 in93 mm of precipitation and 12 in31 cm of snow in a typical March.
- Record high
- 61°16° (1998)
- Record low
- −15°−26° (1972)
- Heating degree days
- 995
- Cooling degree days
- 0
Juneau in April
Highs average 49°9° and lows 33°0°, with 3.5 in88 mm of precipitation and 1.2 in3 cm of snow in a typical April.
- Record high
- 74°23° (2003)
- Record low
- 6°−14° (1963)
- Heating degree days
- 726
- Cooling degree days
- 0
Juneau in May
Highs average 58°14° and lows 40°5°, with 3.5 in89 mm of precipitation in a typical May.
- Record high
- 82°28° (1947)
- Record low
- 25°−4° (1956)
- Heating degree days
- 498
- Cooling degree days
- 0
Juneau in June
Highs average 62°17° and lows 47°8°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 86°30° (1969)
- Record low
- 31°−1° (1955)
- Heating degree days
- 313
- Cooling degree days
- 1
Juneau in July
Highs average 64°18° and lows 50°10°, with 5.1 in131 mm of precipitation in a typical July.
- Record high
- 90°32° (1975)
- Record low
- 36°2° (1950)
- Heating degree days
- 248
- Cooling degree days
- 1
Juneau in August
Highs average 63°17° and lows 49°10°, with 6.4 in163 mm of precipitation in a typical August.
- Record high
- 85°29° (2026)
- Record low
- 27°−3° (1948)
- Heating degree days
- 280
- Cooling degree days
- 0
Juneau in September
Highs average 56°13° and lows 44°7°, with 9.2 in232 mm of precipitation in a typical September.
- Record high
- 74°23° (2025)
- Record low
- 23°−5° (1972)
- Heating degree days
- 447
- Cooling degree days
- 0
Juneau in OctoberThis month
Highs average 47°8° and lows 37°3°, with 8.4 in214 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 63°17° (2018)
- Record low
- 11°−12° (1984)
- Heating degree days
- 707
- Cooling degree days
- 0
Juneau in November
Highs average 38°3° and lows 29°−2°, with 6.5 in166 mm of precipitation and 14 in35 cm of snow in a typical November.
- Record high
- 56°13° (1949)
- Record low
- −5°−21° (1966)
- Heating degree days
- 938
- Cooling degree days
- 0
Juneau in December
Highs average 35°2° and lows 26°−3°, with 6.5 in166 mm of precipitation and 18 in46 cm of snow in a typical December.
- Record high
- 54°12° (1944)
- Record low
- −21°−29° (1949)
- Heating degree days
- 1076
- Cooling degree days
- 0