Manta Ray (Night Dive) Hawaii August – Encounter Guide & Best Sites

Warm, settled water. Plankton thick. Mantas reliable every night dive. An iconic experience.

Encounter overview

Diving or snorkelling with manta rays in Hawaii during August is peak season, with an encounter probability of approximately 85% under normal conditions. Night diving with manta rays feeding under lights is an experience that sits in a category of its own – enormous, gravity-defying animals performing backward somersaults through clouds of zooplankton while you kneel in the dark below.

Best sites

• Garden Eel Cove (Kona)
• Manta Heaven
• Keauhou Bay

What to expect

Manta rays gather at night in locations where lights attract plankton – dive torches, boat anchor lights, or dedicated light rigs. The mantas enter a feeding frenzy, looping repeatedly through the densest part of the plankton cloud, barrel-rolling and banking at close range.

Water conditions in August

Water temperature in Hawaii typically ranges 22-28°C. Visibility at Garden Eel Cove (Kona) in August is generally good; check local liveaboard or dive operator reports the week of your trip for specific conditions. Lava reef, manta night dives, open water is the primary dive style in Hawaii.

Practical tips

Kneel on the sand and keep your torch aimed upward into the water column – this keeps plankton dense in the feeding zone and keeps you out of the manta’s flight path. Do not stand up and wave torches around. Stay still and let them come to you.

Getting there

Fly into Kona (KOA) or Honolulu (HNL) on Oahu. Manta ray night dives at kona, tiger sharks, dolphins, humpback whales in winter. US visa/ESTA requirements apply. Currency: US Dollar (USD).

Is August a good time to visit Hawaii for manta ray (night dive)?

Yes – August is peak season for manta rays in Hawaii. Encounter probability is around 85% on a dedicated trip. Best sites include Garden Eel Cove (Kona), Manta Heaven, Keauhou Bay. Check availability at Garden Eel Cove (Kona) as spaces fill quickly in peak months.