Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 12.8 °C | 15.4 °C | 10 days | Possible, with trade-offs |
| February | 14.4 °C | 14.9 °C | 8 days | Possible, with trade-offs |
| March | 16 °C | 15.1 °C | 9 days | Possible, with trade-offs |
| April | 20 °C | 16 °C | 5 days | Pleasant — a good time to go |
| May | 24.1 °C | 18.5 °C | 5 days | Ideal — one of the best times of year |
| June | 28.8 °C | 22.3 °C | 4 days | Ideal — one of the best times of year |
| July | 31.8 °C | 25.1 °C | 2 days | Ideal — one of the best times of year |
| August | 31.4 °C | 25.8 °C | 2 days | Ideal — one of the best times of year |
| September | 28 °C | 24.8 °C | 3 days | Ideal — one of the best times of year |
| October | 23.1 °C | 22.4 °C | 4 days | Pleasant — a good time to go |
| November | 18.9 °C | 19.6 °C | 7 days | Possible, with trade-offs |
| December | 14.7 °C | 17.1 °C | 8 days | Possible, with trade-offs |
Before you go
Three things to check once you have picked your dates.
Entry
Greece is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 11 August 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Marathónas in May?
The sea averages 18.5°C in May — too cold for most swimmers.
How hot is Marathónas in May?
Expect 24.1°C in the afternoon and 15.4°C at night, averaged over the last 10 years.
Does it rain a lot in Marathónas in May?
Around 5 days with rain (≥ 1 mm) in the month — 17% of days.