In terms of geography and climate, the Cyclades and Ionian Islands are actually quite similar. They’re both off the coast of Greece, meaning they have comparable climates and weather. During the peak season* (June, July and August), you can enjoy average temperatures of 28°C regardless of which archipelago you’re visiting. That said, the Cyclades tend to be a bit warmer and drier than the Ionian Islands.
You should also know that these two island groups are surrounded by different bodies of water. The Cyclades Islands are on the Aegean Sea (on the east side of mainland Greece) while the Ionian Islands are on the — you guessed it! — Ionian Sea (on the west side of mainland Greece).
Other than that, the biggest difference between these two groups of Greek Islands is their size. The Cyclades Islands have a combined land area of 2,528 square kilometres and are comprised of more than 30 islands (24 of which are inhabitable). Some of the most popular islands are:
- Milos
- Mykonos
- Naxos
- Paros
- Santorini
- Syros
The Ionian Islands have a combined land area of 2,307 square kilometers and are comprised of seven main islands:
- Corfu
- Ithaca
- Kefalonia
- Kythera
- Lefkada
- Paxi (Paxos)
- Zakynthos
However, just because the Cyclades technically cover more ground, doesn’t mean they’re larger. Each individual Ionian island is bigger than each individual Cyclades island. For example, the biggest island in the Cyclades (Naxos) is one-third the size of the largest island in the Ionian Islands (Kefalonia).
*Try to visit during the shoulder seasons (May or mid-September to mid-October) for only slightly cooler temperatures and way fewer crowds.