Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 13.7 °C | 17.2 °C | 11 days | Possible, with trade-offs |
| February | 14.5 °C | 16.8 °C | 8 days | Possible, with trade-offs |
| March | 15.6 °C | 16.8 °C | 7 days | Possible, with trade-offs |
| April | 18.6 °C | 17.5 °C | 3 days | Possible, with trade-offs |
| May | 22 °C | 19.5 °C | 3 days | Pleasant — a good time to go |
| June | 26.3 °C | 22.6 °C | 2 days | Ideal — one of the best times of year |
| July | 28.5 °C | 24.3 °C | 0 day | Ideal — one of the best times of year |
| August | 28.3 °C | 25.2 °C | 1 day | Ideal — one of the best times of year |
| September | 26.1 °C | 24.6 °C | 1 day | Ideal — one of the best times of year |
| October | 22.4 °C | 22.5 °C | 2 days | Pleasant — a good time to go |
| November | 19.1 °C | 20.4 °C | 4 days | Pleasant — a good time to go |
| December | 15.5 °C | 18.2 °C | 9 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 Santorin in April?
The sea averages 17.5°C in April — too cold for most swimmers.
How hot is Santorin in April?
Expect 18.6°C in the afternoon and 13.9°C at night, averaged over the last 10 years.
Does it rain a lot in Santorin in April?
Around 3 days with rain (≥ 1 mm) in the month — 11% of days.