Weather in Kefalonia in October

How October compares

October is the 5th warmest month of the year in Kefalonia and ranks 85th of 134 destinations we compare for October - see where else is hot in October. Within Greece it is 25th of 44 (Greece in October). Against London's average high of 14.6°C in October, Kefalonia is 7.4°C warmer by day and 10.7°C warmer at night.

Daytime and night-time in October

The typical October day in Kefalonia peaks at 22.0°C, but that is an average: the warmest 10% of days reach 24.4°C or more. Roughly 1 in 19 days top 25°C and 1 in 1000 pass 30°C. Nights average 19.1°C; one night in ten drops to 15.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest October day here reached 31.0°C (2020-10-05) and the coldest night 12.4°C (2017-10-29).

Rain in October

Wet (more than 8 rainy days): about 9 days with 1 mm or more, 104 mm in total. Year to year it varies a lot - the wettest October was 2016 with 255 mm, the driest 1995 with 9 mm. Humidity averages 74%.

Sea temperature in October

The sea averages 22.8°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.1°C to 23.6°C. For the warmest sea here, come in August (26.0°C).

Sunshine and daylight

Around 6.5 hours of sunshine a day (estimated from cloud cover), 11.0 hours of daylight: the sun rises about 07:47 and sets about 19:01 local time in mid-October. Average cloud cover is 41%.

Is October a good time to visit Kefalonia?

It is a reasonable choice: warm days but expect showers. The best months for Kefalonia on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug, Sep.

Warm days without dependable sunbathing heat

Expect weather that feels warm rather than hot, with light clothing useful during the day and a layer sensible for evenings. The average night low is 19°C, although the coldest nights can fall to 16°C or below, so packing only summer clothes would be optimistic. Days reaching 25°C account for just 5%, which makes October a better fit for travellers who dislike strong heat than those seeking reliably hot afternoons. You are unlikely to need to arrange every day around avoiding midday heat, but keep warmer clothing handy for cooler spells rather than treating the average as a promise.

Leave room in your plans for rain

Rain is the main compromise. About 8 days bring measurable rain, and October is classed as wet, so a light waterproof deserves space in your luggage. That does not mean every rainy day is a washout, but the figures cannot tell you how showers will fall during your stay. There are about 6.5 hours of sunshine within 11 hours of daylight on average, leaving scope for time outdoors without promising clear skies throughout. Keep weather-dependent plans movable and check the forecast before committing to a day outside. If uninterrupted sunshine is essential to your holiday, October is a less comfortable bet.

The sea is still suitable for swimming

The sea is a stronger reason to choose October than the prospect of high air temperatures. At an average of 22.8°C, it falls in the suitable-for-swimming bracket, with the year-to-year range running from 22°C to 24°C. That makes bringing swimwear worthwhile, even if you would not choose to sit out on every cloudy day. Aim to swim when the local weather and sea conditions are comfortable, and have something dry to put on afterwards. Water temperature alone does not guarantee a pleasant beach day: rain and cooler air can change how inviting it feels once you are out of the water.