Big Island Water Temperatures by Month | Kona Snorkel Trips

The waters surrounding the Big Island make for some amazing ocean encounters. Located in the sub-tropics Hawaii Island straddles the warm waters near the equator and the cooler waters of the temperate zone. It’s one of the reasons Humpback Whales travel here from Alaska. These temperatures are averages and so they will only represent temperatures in the past. If you are looking for current up to date Big Island water temperatures they are best found in the map below. Keep in mind that these are guidelines and Big Island water temperatures will vary from year to year. Surprisingly to many people the water temperatures on Big Island are cooler than they might expect.

January – 78°F or 25.6°C

February – 77°F or 25°C

March – 77°F or 25°C

April – 78°F or 25.6°C

May – 79°F or 26°C

June – 80°F or 26.6°C

July – 81°F or 27°C

August – 81°F or 27°C

September – 80°F or 26.6°C

October – 81°F or 27°C

November – 80°F or 26.6°C

December – 78°F or or 25.6°C

Or Press the image below to see the near real-time water temperature updates:

If you’d like to get in the water to experience water temperatures in Kona the Manta Ray Snorkel Kona is a great way to do it! Check out our Kona Snorkel tours page. In December – April we run whale watching Kona tours. The temperature doesn’t vary widely on the Big Island from winter to summer but it is a bit cooler so plan your swimwear accordingly. Freedivers will typically use 1.5mm wetsuits in the summer and 3mm or greater in the winter. Scuba divers will typically wear 3mm wetsuits in the summer and 5mm wetsuits in the winter. Keep in mind this will vary by body type and your propensity for getting cold which varies from person to person. On our Captain Cook Snorkeling tour we will take you to beautiful Kealakekua Bay to see the Captain cook monument and snorkel the beautiful reefs in one of Hawaii’s best snorkeling spots. Along the way you may encounter some whales or even some dolphins you never know! There are so many aquatic adventures here in Kona for you to experience so come check out all that Kona Snorkel Trips has to offer. You can even book multiple charters and save with our combo packages. You can also do a bit of diving if you visit our sister company Kona Honu Divers. They are Hawaii’s top rated diving company in Kona Hawaii and have the same owner.