Sperm whales are one of the most awe-inspiring marine mammals on Earth—and yes, they pass right by Maumere Bay. While November is traditionally their season, we’ve started seeing them as early as April and as late as July. Read on to learn when, where, and how to catch a glimpse of these giants in the wild.
When Sperm Whales Visit Maumere Bay (And Why Rain Might Be Your Best Guide)
In our experience, the sperm whales of Maumere Bay tend to appear when the first rains of the season begin. Traditionally, that meant late October or early November, when the change in weather seems to trigger their migration route.
But things are changing.
Just last year, we spotted six sperm whales in July, and this year (2025), two were seen in early April—both sightings during rainfall. So while November remains a reliable time to hear or possibly see them, the window is now wider than we once thought.
And yes—we’ve even heard them at night in November while lying in bed at the retreat. It’s wild.
Why Maumere Bay Attracts These Giants of the Deep
Maumere Bay lies along the edge of the Savu Sea, a deep body of water that’s part of one of Indonesia’s largest marine protected areas. This area is an underwater superhighway for marine megafauna—over 30 species of marine mammals have been recorded here.
What makes it ideal for sperm whales?
- Deep drop-offs and nutrient-rich currents
- A thriving population of deep-sea squid, their favourite food
- A peaceful route through a protected ecosystem
If you’re into marine life, this place is an untouched gem.
A Closer Look at Sperm Whales
Let’s talk about these deep-diving legends.
Sperm whales (Physeter macrocephalus) are the largest toothed predators on Earth, growing up to 18 metres long and weighing over 50 tons. Their signature blocky heads house the largest brain of any animal on the planet.
In the deep dark ocean, they hunt squid using powerful echolocation clicks—so loud they can be heard from kilometres away. And when they rest, they float vertically in the water like pillars, which is eerie and unforgettable to witness.
The Rain Connection: What Locals Know That Tourists Don’t
We’ve learned from years of living and diving here that the first rains seem to bring the whales.
Why?
- Rain often triggers plankton blooms
- More plankton means more squid activity
- And that means whales come closer to the surface and the coast to feed
As climate patterns shift, so does whale timing. So now, April to November is your best bet—not just October to November.
How to Increase Your Chances of Seeing Sperm Whales
Here’s our honest advice on getting the most out of your visit:
- Come between April and November for the best odds
- Join a liveaboard or early morning dive into deeper water
- Stay near the coast—you might hear them at night
- Ask locals and dive guides—we often hear them before we see them
Or better yet, come stay with us at Happy Dive Retreat. You’ll be in the best possible place to experience this, right from your beachside bungalow.
Even If You Miss the Whales…
You’ll still be in one of the most diverse marine habitats in the world.
Other sightings include:
- Pilot whales
- Blue whales
- Several dolphin species
- And of course, Maumere’s world-famous coral reefs and muck diving opportunities
Ready to Dive Into the Wild Side of Flores?
At Happy Dive Retreat, we live and breathe Maumere’s marine life. Whether it’s spotting whales at dawn, diving with rays, or relaxing on the beach after a night dive, we’re here to help you experience the best of it.
Book your stay now at happydiveretreat.com and come listen for whales with us.
