In short
- Swimming is permitted, but watch out for sharp rocks and passing boats.
- Water temperatures range from 22°C in June to 26°C in September.
- Bring water shoes and a snorkel mask to see the glowing sea floor.
In this article
Most small boat tours include a dedicated swimming stop near or inside the cave arches. Because you jump directly from the boat into deep water, confident swimming skills are required. The natural sunlight reflects off the white seabed up to 5 meters below, creating the famous glowing effect.
Is it possible to swim inside the Blue Caves?
Yes, swimming is allowed inside and around the sea caves.
Small group boat tours usually anchor near the entrance of Mikri Spilia (Small Cave) or Megali Spilia (Grand Cave). From there, you can swim into the arches. You must stay cautious of regular boat traffic entering and exiting the restricted 4-meter cave openings.
How warm is the water in the Blue Caves?
The water temperature reaches 22°C in June and peaks at 26°C in August and September.
The sea is comfortable for swimming during the main summer months. Because the caves are open to the open sea, temperatures depend heavily on the season.
| Month | Average Water Temperature |
|---|---|
| June | 22°C |
| August | 26°C |
| September | 26°C |
Is it safe to snorkel in the Blue Caves?
Yes, snorkeling is safe and highly recommended to see the underwater glowing effect.
The turquoise light comes from natural sunlight bouncing off the white limestone bottom at depths of 4 to 5 meters. Wearing a snorkel mask gives you a clear view of this optical phenomenon. Stay close to your boat and watch for slippery edges.
What gear do I need for swimming in Blue Caves Zakynthos?
Pack water shoes, a snorkel mask, and reef-friendly sunscreen.
- Water shoes: Protect your feet from the sharp rocky edges of the caves.
- Snorkel mask: Essential for seeing the underwater rock formations.
- Reef-friendly sunscreen: Required to protect the fragile marine ecosystem.
- Quick-dry towel: Helpful for warming up quickly after returning to the boat.
Which cave is best for swimming?
Mikri Spilia (Small Cave) offers a quieter swim compared to the main arches.
This smaller, tighter cave system sits next to the main arches. It features unusual rock shapes beneath the surface. It receives less heavy boat traffic than Megali Spilia, making it a safer spot for snorkeling.
Do large boat tours allow swimming in the caves?
Large boats cannot enter the caves, which severely limits your swimming access.
The cave arches have a maximum clearance of 4 meters. Only boats with under 50 seats can physically enter. If you take a larger cruise, you will anchor far from the caves, requiring strong stamina to swim all the way in.
Questions travellers ask
Can you touch the bottom of the Blue Caves?
No, the glowing water is visible at depths of 4 to 5 meters. You cannot stand. You will need to tread water or swim the entire time.
Are there dangerous currents inside the caves?
Trips are canceled if there are strong swells from the north winds. However, boat traffic is a bigger hazard than currents. Captains are restricted to speeds under 6 knots in this zone.
Do I need to bring my own snorkel gear?
Yes, unless your specific tour clearly provides it. It is always best to pack your own snorkel, mask, and water shoes to guarantee the best experience.
