Greece

Kefalonia weather by month

Kefalonia is warmest in August, with average highs of 32°C, and coolest in January at 15°C. The sea ranges from about 16°C to 27°C, warmest in August.

WarmestAugust32°C average high
CoolestJanuary15°C average high
Warmest seaAugust27°C on average
From Dublin≈ 3h 45mdirect, estimated

Kefalonia 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 12 days.

Average low to highSea temperatureRainy days

Month by month

Kefalonia: average weather for each month, 2011–2025; sea 2022–2025
Month	High	Low	Sea	Rainy days	Rain	Sky	Days 25°C+
January	15°	9°	16°	12	150 mm	Often cloudy	0%
February	16°	9°	16°	10	108 mm	Often cloudy	0%
March	17°	10°	16°	9	90 mm	Often cloudy	0%
April	20°	12°	16°	4	34 mm	Some cloud	1%
May	24°	15°	19°	3	22 mm	Some cloud	24%
June	28°	19°	23°	1	13 mm	Mostly clear	96%
July	31°	22°	26°	0	5 mm	Mostly clear	100%
August	32°	23°	27°	1	5 mm	Mostly clear	100%
September	28°	20°	25°	4	67 mm	Some cloud	96%
October	24°	17°	23°	8	119 mm	Some cloud	40%
November	21°	14°	21°	11	186 mm	Often cloudy	2%
December	17°	10°	18°	11	151 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≈ 3h 45m
From Cork≈ 3h 45m
From Belfast≈ 3h 45m
From London≈ 3h 15m
From Manchester≈ 3h 30m
From Glasgow≈ 3h 45m

Similar weather

Air: Copernicus ERA5-Land, 2011–2025, for the land nearest Kefalonia (4 m), matched to the official 1991-2020 averages for Kefalonia airport (HNMS). Sea: Copernicus ERA5 sea surface temperature, 2022–2025. Averages describe past weather, not a forecast.