Greece

Santorini weather by month

Santorini is warmest in July, with average highs of 30°C, and coolest in January at 15°C. The sea ranges from about 17°C to 26°C, warmest in August.

WarmestJuly30°C average high
CoolestJanuary15°C average high
Warmest seaAugust26°C on average
From Dublin≈ 4h 15mdirect, estimated

Santorini through the year

Beach weather (highs of 25°C or more and fewer than seven rainy days) is most likely June to September. January is the wettest month, with rain on about 10 days.

Average low to highSea temperatureRainy days

Month by month

Santorini: average weather for each month, 2011–2025; sea 2022–2025
Month	High	Low	Sea	Rainy days	Rain	Sky	Days 25°C+
January	15°	10°	18°	10	73 mm	Often cloudy	0%
February	15°	11°	17°	7	58 mm	Often cloudy	0%
March	17°	12°	17°	6	45 mm	Some cloud	0%
April	20°	14°	17°	2	15 mm	Some cloud	0%
May	24°	17°	19°	1	9 mm	Some cloud	17%
June	28°	21°	23°	0	3 mm	Mostly clear	98%
July	30°	24°	24°	0	0 mm	Mostly clear	100%
August	30°	24°	26°	0	1 mm	Mostly clear	100%
September	28°	22°	25°	1	4 mm	Mostly clear	97%
October	23°	18°	23°	2	16 mm	Some cloud	19%
November	20°	15°	21°	4	33 mm	Some cloud	0%
December	17°	12°	19°	9	63 mm	Often cloudy	0%

Shaded rows: beach weather (June to September). Rainy days = days with 1 mm of rain or more, as weather stations count them. Sky = average cloud cover. How we measure

Flying time

Estimated from the distance for a direct flight. Real schedules vary, and many long-haul trips need a connection.

From Dublin≈ 4h 15m
From Cork≈ 4h 15m
From Belfast≈ 4h 15m
From London≈ 3h 45m
From Manchester≈ 4h
From Glasgow≈ 4h 15m

Similar weather

Air: Copernicus ERA5-Land, 2011–2025, for the land nearest Santorini (14 m), matched to the official 1991-2020 averages for Santorini airport (HNMS). Sea: Copernicus ERA5 sea surface temperature, 2022–2025. Averages describe past weather, not a forecast.