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Greece in May: Weather, Sea Temperature and Crowds
Greece in May: about 25°C, sea around 19°C, everything opening for summer, and fewer crowds than June to September.
By the iLoveGreece editorial team · Last reviewed 2026-11
Quick answer
May is a sweet spot: warm days around 24–26°C, long evenings, islands open for the season and far fewer crowds than summer. The sea is about 19°C, refreshing but swimmable for many. Ferries switch to fuller summer timetables during the month.
At a glance
| Athens | Crete | Cyclades | |
|---|---|---|---|
| Daytime high | ≈25°C | ≈24°C | ≈23°C |
| Sea | — | ≈19°C | ≈19°C |
| Rainy days | ≈4 | ≈3 | ≈2 |
What to know
- Most hotels, tavernas and boat trips are open by mid-May.
- Good month to combine Athens, two or three Cyclades and Crete.
- Midday sun is already strong: carry water and sunscreen at sites.
- 1 May is Labour Day; some transport may strike or run reduced.
FAQ
Is the sea warm enough in May?
About 19°C: fine for a quick swim, cool for long ones. It warms through the month.
Is May busy in Greece?
Busier than April but much quieter than July and August.
Related guides
- Santorini in October: Weather, Sea Temperature and Is It Worth It?
- Greece in September: Warm Sea, Fewer Crowds, Best Month?
- Greece in June: Weather, Sea and How Busy It Gets
- Greece in July: Heat, Wind, Crowds and How to Plan
- Greece in April: Weather, Easter and Which Islands Are Open
- Greece in October: Weather, Swimming and What Closes
Updated 2026-11. General planning guidance. Check with operators and local authorities.