Average Ocean Temperatures for Hawaii

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The water's warm enough to swim in at any time of the year on beaches in Hawaii. The Pacific islands' average ocean temperatures for each month are listed below in degrees Fahrenheit and degrees Celsius.


At Honolulu on Oahu, the ocean stays as warm as a heated swimming pool all year long. Ocean temperatures do differ by a few degrees throughout the Hawaiian Islands, though. The water off Honolulu, for instance, is typically 5 °F (3 °C) warmer than at Hilo on the Big Island.

Yet Hawaii's ocean temperatures don't vary much from month to month. The water fluctuates by only 5 °F over the year off Honolulu. At Hilo, the temperature stays even steadier, varying just 3 °F (2 °C) annually.

The Pacific Ocean at both cities reaches its highest temperature in September and October. By March, Hilo's water has dropped to its coldest of the year, at 71 °F (21.7 °C), on average. The water during winter at Honolulu's beaches typically maintains a steady 76 °F (24 °C) from January through to April.

Average ocean temperature in °F
  Honolulu Hilo
January 76 72
February 76 72
March 76 71
April 76 72
May 78 72
June 79 74
July 80 74
August 80 75
September 81 75
October 81 75
November 79 74
December 77 73
Annual 78 73

Average water temperature in °C
  Honolulu Hilo
January 24 22
February 24 22
March 24 22
April 24 22
May 26 22
June 26 23
July 27 23
August 27 24
September 27 24
October 27 24
November 26 23
December 25 23
Annual 26 23
Reference

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

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Ocean Temperatures

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