Humpback Whale Costa Rica September – Encounter Guide & Best Sites

Peak continues. Southern population supplemented by a few North Pacific whales. Caño Island calm season for combined diving.

Encounter overview

Diving or snorkelling with humpback whales in Costa Rica during September is high season, with an encounter probability of approximately 80% under normal conditions. Humpback whales are the ocean’s showmen – breaching, tail-slapping, and singing in frequencies that travel hundreds of kilometres. In-water encounters are among the most profound experiences in ocean travel.

Best sites

• Marino Ballena NP
• Drake Bay
• Uvita

What to expect

Humpbacks migrate between polar feeding grounds and tropical breeding/calving areas. Singing males are stationary for minutes at a time – a gift for in-water encounters. Mothers with calves are highly protective; maintain distance and wait for the whale to approach.

Water conditions in September

Water temperature in Costa Rica typically ranges 22-29°C. Visibility at Marino Ballena NP in September is generally good; check local liveaboard or dive operator reports the week of your trip for specific conditions. Pelagic liveaboard, cocos island is the primary dive style in Costa Rica.

Practical tips

In-water encounters require a licensed operator and often a permit. Do not enter the water if the whale is actively fleeing. Fins and masks only – scuba bubbles disturb whales. The whales often approach curious, stationary humans on their own terms.

Getting there

Fly into San José (SJO) or Liberia (LIR). Cocos island hammerheads, whale sharks, humpback whales, bull sharks. Visa-free for most Western nationalities (90 days). Currency: Costa Rican Colón (CRC); USD widely accepted.

Is September a good time to visit Costa Rica for humpback whale?

Yes – September is high season for humpback whales in Costa Rica. Encounter probability is around 80% on a dedicated trip. Best sites include Marino Ballena NP, Drake Bay, Uvita. Check availability at Marino Ballena NP as spaces fill quickly in peak months.