The manta ray night dive off Keauhou Bay is the marine wildlife experience that defines the Big Island. Giant Pacific mantas — some with wingspans exceeding twelve feet — are attracted nightly by plankton drawn to the surface by dive lights, and they circle within arm's reach of snorkelers floating face-down at the surface. These are resident animals, not seasonal migrants: operators consistently report 85–90% nightly sighting success rates year-round.
The experience is available to both divers and snorkelers, with multiple operators running tours from Keauhou Bay every evening weather permits. Beyond the mantas, the island's marine wildlife includes Hawaiian green sea turtles hauling out daily on Punaluʻu Black Sand Beach and at snorkel sites around the Kona coast, Hawaiian monk seals occasionally sighted at quieter beaches, and spinner dolphins working the bays most mornings. In Hawaii Volcanoes National Park, the Hawaiian nene goose — the world's rarest goose, brought back from near-extinction — is commonly sighted along the Devastation Trail and near the Kilauea Military Camp area.
| Month | High / Low | Rain Days | Conditions |
|---|---|---|---|
| Jan | 80° / 65°F | 10 | Peak |
| Feb | 80° / 65°F | 9 | Peak |
| Mar | 81° / 66°F | 8 | Peak |
| Apr | 82° / 67°F | 6 | Peak |
| May | 84° / 69°F | 4 | Peak |
| Jun | 86° / 71°F | 3 | Peak |
| Jul | 87° / 72°F | 3 | Peak |
| Aug | 88° / 73°F | 4 | Peak |
| Sep | 88° / 72°F | 4 | Peak |
| Oct | 86° / 71°F | 6 | Peak |
| Nov | 83° / 68°F | 8 | Peak |
| Dec | 81° / 66°F | 10 | Peak |
Main town on the west side. Restaurants, dive operators, manta ray tours. Airport 15 minutes north.
Driest area on the island — 9 inches of rain annually. Resort area. Waikoloa, Mauna Kea Resort, Mauna Lani.
Kīlauea crater, Crater Rim Drive, lava tube. Kīlauea erupting episodically since December 2024. 2hr from KOA, 45min from Hilo.
Halemaʻumaʻu crater — active eruption since Dec 23, 2024. Lava fountaining episodes visible from multiple overlooks at night.
13,796 feet. Finest stargazing on earth. Visitor Information Station at 9,200ft — no 4WD required. Summit requires 4WD. 13 observatories.
Manta Ray Village — primary launch point for manta ray night dives and snorkel tours. Year-round resident mantas.
Best snorkeling in Hawaii. Protected Marine Life Conservation District. Captain Cook Monument. Accessible by boat tour from Kona.
Wettest city in the US. Botanical gardens, farmers market, waterfalls. Gateway to Volcanoes National Park. ITO airport.
2,670-foot elevation. Cool green ranching country. Gateway to Mauna Kea and the Hamakua Coast.
Best native forest birding on the island. Iiwi, apapane, Hawaii creeper, akiapolaau. East slope of Mauna Kea.
Sacred valley on the Hamakua Coast. 2,000-foot walls, black sand beach, taro fields. Steep road requires 4WD.
Most famous black sand beach on the island. Green sea turtles haul out here regularly. Between Volcanoes NP and Hilo.
Manta ray night dive and snorkel tours from Keauhou Bay are cancelled on nights when ocean swell or wind makes conditions unsafe. Summer delivers the calmest conditions and lowest cancellation rates. Stay multiple nights near Kona if the manta dive is a priority — a single-night booking that gets cancelled leaves no options. Operators post same-day conditions online and most offer rebooking when tours cancel for weather.
Hawaii Volcanoes National Park is 2 hours from Kona and 45 minutes from Hilo. The Kīlauea eruption status changes day to day — a fountaining episode at night is dramatically different from the same overlooks during a pause between episodes. Check the USGS Hawaiian Volcano Observatory website (usgs.gov/volcanoes/kilauea) the morning of your visit. If an episode is forecast, evening and night visits to the park deliver the best experience. Vog levels also vary — check vog.hi.gov for air quality.
Driving from the Kohala Coast to Hawaii Volcanoes National Park takes 2 hours each way. From Hilo to Kona is 1.5 to 2 hours via the Saddle Road. Most visitors underestimate the distances and overload their itineraries. Pick a base that matches your primary activities — Kona or Kohala for diving and the manta ray dive, Hilo or Volcano Village for the national park and east side waterfalls — and plan day trips accordingly.
Wildist-vetted hotels for Big Island, Hawaii coming soon.