Ionian Islands

Ionian Islands, Greece © By Katsaras Kyriakos

Ionian Islands Sea Temperature

This page provides detailed information about the water temperature in Ionian Islands, Greece. All countries, cities and resorts on the coast. The range of sea temperatures for today. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature in Ionian Islands: General Trends and Swimming Opportunities

Original name of the region: Ιόνια νησιά

The Ionian Islands, located off the western coast of Greece, are renowned for their turquoise waters and mild climate. During the summer months (June to September), sea temperatures typically range from 24–27°C (75–81°F), providing ideal conditions for swimming, snorkeling, and other water activities. Beaches such as Navagio in Zakynthos, Myrtos in Kefalonia, and Porto Katsiki in Lefkada attract visitors with their warm, clear waters and stunning scenery.

In the spring (April to May) and autumn (October to November), the sea begins to cool slightly, with temperatures averaging 20–23°C (68–73°F). While the waters are not as warm as during the summer, they remain comfortable for swimming, especially for those accustomed to milder temperatures. These seasons also offer a quieter and more relaxed atmosphere, perfect for exploring the islands' natural beauty without the peak-season crowds.

Winter months (December to February) bring cooler sea temperatures, ranging from 14–16°C (57–61°F). While swimming is less common during this time, the Ionian Islands still provide opportunities for coastal walks, sailing, and enjoying the tranquil seaside environment. The region’s natural charm and warm hospitality make it an attractive destination throughout the year.

Geographical Location of Ionian Islands

Frequently Asked Questions About Ionian Islands and its Water Temperatures