Average Ocean Temperatures for Alaska

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Average ocean temperatures at Anchorage and Juneau, Alaska are listed below for each month in degrees Fahrenheit and degrees Celsius.

Ocean temperatures off Anchorage in southern Alaska vary remarkably from summer to winter.

During most of winter, the sea temperature at Anchorage hovers just below the freezing point of fresh water. But over the long northern days of summer, water in Anchorage's sheltered inlet of Knik Arm warms rapidly. Surprisingly, these Alaskan waters become warmer in summer than those along the Pacific coast of central California.

Compared with Anchorage, the sea at Juneau in southeast Alaska doesn't get as cold in winter nor as warm in summer. Still, during July and August, the water there usually isn't much cooler than water at beaches much farther south.

Average ocean temperature in °F
  Anchorage Juneau
January 31 36
February 31 36
March 32 37
April 34 40
May 44 46
June 54 51
July 58 52
August 57 51
September 53 49
October 44 44
November 34 40
December 32 38
Annual 42 43

Water temperature averages in °C
  Anchorage Juneau
January  -1   2
February  -1   2
March   0   3
April   1   4
May   7   8
June 12 11
July 14 11
August 14 11
September 12   9
October   7   7
November   1   4
December   0   3
Annual   6   6
Reference

National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).

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