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You have seen the footage: a humpback calf nosing up beside its mother, a swimmer floating a few meters away. What the video does not show is how a Tonga whale swim day actually runs, from the alarm clock to the last dry towel. If you are weighing a swimming with humpback whales tour in Tonga, here is what to expect, hour by hour.
The day starts with breakfast and a short ride to the wharf in Nuku'alofa, where the boat leaves. You wear your swimsuit under a wetsuit, with your mask, snorkel and fins in a mesh bag. The water around Tongatapu is around 23 to 25 degrees Celsius in September, which feels warm for the first five minutes and cool after an hour of floating, so most people wear a full wetsuit. Sunscreen goes on before the wetsuit, and a rashguard helps with rubbing.
Take seasickness tablets before you leave if you are even slightly prone to it. The crossing is short, but you will spend hours on the boat, and the swell in open water can surprise people.
Finding a whale is a team sport. The skipper and a spotter scan for blows, the tall misty puffs that rise when a humpback exhales. You can sometimes see a blow from a kilometer away on a calm day. Once the boat has a mother and calf or a pair of adults, the skipper approaches slowly and stays well back, and the guide watches the whales' behavior before anyone gets in the water.
A calm, resting mother with a calf is the encounter most people dream of. Tonga is one of the few places where regulated swims are allowed, and the rules protect the animals. Only a small number of swimmers can be in the water with a whale at once, in Tonga that is four, so the group takes turns.
When the guide gives the signal, you slip into the water quietly, no jumping and no splashing. You hold on to a line or stay close to the guide, put your face down and breathe through the snorkel. Often you hear the whales before you see them. Humpbacks sing in the breeding season, and the sound travels through your body, a low groan that you feel in your chest.
Then the shape appears out of the blue. A calf may drift up to look at you. The mother usually stays just below. The rule is simple: you do not chase, touch or swim toward the whale. If it wants to come closer, it will. Encounters last anywhere from a few minutes to half an hour. You rotate in small groups, so nobody waits long, and the group on the boat watches from the deck while others swim.
Between swims you climb back on board, dry off and eat. Lunch might be on the boat or on a quiet island, depending on where the whales lead the crew. Bring a thin windbreaker, because the wind on a moving boat feels cold when you are wet. This is also the moment to drink a lot of water. Salt water and sun dry you out faster than you think.
You head back out as long as the light and the whales cooperate. Some days give you three or four swims, others give you one long one. A rule that surprises visitors: Tonga rests on Sundays by law, so no boats go out. Most groups use that day for caves, a village visit and church singing, which is a nice break in the middle of a whale week.
Evenings are for dinner, footage swaps and early nights. Whale swimming is more tiring than it sounds.
You do not need a diving license, because it is snorkeling only. Tongan rules do not allow scuba or freediving with the whales. You do need to feel comfortable in open water with a mask and fins, since you may swim a few minutes to keep up. Our post on whether swimming with humpbacks is safe goes deeper, and the best time to swim with humpbacks in Tonga explains the season, which runs July to October.
We run this as a week on Tongatapu, away from the crowds of Vava'u, with a private boat, five whale days and a maximum of eight guests. Wetsuit, mask, fins and airport transfers are included. If you would like to see the full plan for the week, take a look at our Whales of Tonga expedition.
