What Makes Spring in Ibiza and Formentera Unique? Spring in the Mediterranean is far more than just a seasonal temperature change. Beneath the surface, the sea comes to life. As the sun warms the waters and daylight hours increase, many marine species begin their breeding season, schools of fish venture closer to the shore, and the posidonia seagrass begins its regeneration cycle.

For those keen on snorkelling or diving, spring is an incredible time to experience a more active and dynamic marine ecosystem than at any other point in the year.

Springtime marine flora: A vibrant seabed

Posidonia at Its Peak

Throughout winter, dead posidonia leaves accumulate along the shore, forming natural barriers that protect beaches from the force of the waves. However, spring marks the beginning of a new cycle—older leaves are washed away by the currents, making way for fresh, new growth.

What you’ll notice in spring:

• Even clearer waters, as posidonia enhances its natural filtration process.
• Fewer floating leaves, improving visibility for snorkelling and diving.
• An increase in juvenile fish, as they use the seagrass meadows as a protective nursery.

Seasonal Algae Adding Colour to the Seabed

While posidonia is the undisputed star of Ibiza’s underwater landscape, other algae species take centre stage in spring. Red and brown algae flourish at this time, coating the rocks in rich tones of crimson and green, creating a more colourful, dynamic underwater scene.

Best places to witness this transformation:

• Cueva de la Luz (Ibiza’s north coast): A mesmerising display of natural light and seasonal algae colours.
• Punta Pedrera (Formentera): A rocky seabed where springtime algae form a unique natural mosaic.

Springtime fish and marine species

Juvenile fish and the breeding season

Spring is a peak breeding season for many species, meaning that if you dive at this time, you’ll witness large schools of tiny, newly hatched fish swimming in synchronisation.

What you’ll notice in spring:

• A greater presence of young fish in coastal waters.
• Adult fish behaving more protectively, guarding their nests.
• More cleaner fish, helping other species maintain healthy skin by removing parasites.

Where to see this:

• Cala d’Hort: A protected area teeming with juvenile fish in spring.
• Espalmador Island (Formentera): Shallow waters perfect for spotting different species in their early stages.

The arrival of migratory species

Many marine creatures use the Mediterranean as a migration route, making spring a key season to see them as they pass through Ibiza’s waters.

Which species to look out for:

• Ocean sunfish (Mola mola): These enormous, unusual fish can be spotted basking near the surface on sunny days, warming up after spending winter in deeper waters.
• Rays and stingrays: In spring, they venture into shallower waters, making them easier to see.
• Seahorses: Though present all year round, they become more visible in spring due to their breeding season.

Best places to spot migratory species:

• Ses Margalides (Ibiza): A prime spot to see ocean sunfish in April and May.
• Es Freus (the channel between Ibiza and Formentera): A high-traffic area for migratory fish during spring.

Fewer Jellyfish, safer swimming

One of the most favourable aspects of springtime in Ibiza is that, unlike in summer, jellyfish numbers are significantly lower.

Cooler currents prevent large blooms from forming, making spring an ideal season for open-water swimming and snorkelling without concern.

The safest places to swim in spring:

• Cala Xarraca (Ibiza): A sheltered bay with calm waters and minimal currents.
• Illetes Beach (Formentera): Its location ensures that strong currents rarely carry jellyfish into the area at this time of year.

How does Spring compare to other Seasons in Ibiza’s waters?

Feature	Spring	Summer	Autumn	Winter
Water temperature	16–20°C	24–28°C	18–22°C	14–16°C
Visibility	Excellent – minimal boat traffic	Good, but more particles in the water	Very good	The clearest, but colder
Juvenile fish presence	High – breeding season	Lower – more adult fish	Migration period begins	Low – most species move to deeper waters
Jellyfish	Few	High, especially in July and August	Fewer	Almost none
Posidonia activity	Active regeneration, clearest waters	Stable, vibrant turquoise waters	Older leaves start shedding	Dormant, leaves accumulate on beaches

Why explore Ibiza and Formentera waters in Spring?

Spring is the ultimate season for those who want to experience a more peaceful, natural side of the Mediterranean. The waters are cleaner, marine life is at its most active, and the sea remains largely free from summer’s crowds and boat traffic.

If you’re keen to discover the true essence of Ibiza’s underwater world, this is the time to do it—whether by snorkelling, diving, or simply sailing through its crystal-clear waters.

If you want to experience the most authentic side of Ibiza, the best way is from the sea. At Ibiza Marine Charter, we take you to those places where the island reveals its purest beauty. Whether you’re looking for relaxation, adventure, sport, or pure escapism, we’ll help you find the perfect boat for your route and your ideal experience.