Weather in Kefalonia in June

How June compares

June is the 4th warmest month of the year in Kefalonia and ranks 98th of 134 destinations we compare for June - see where else is hot in June. Within Greece it is 30th of 44 (Greece in June). Against London's average high of 19.6°C in June, Kefalonia is 5.2°C warmer by day and 9.9°C warmer at night.

Daytime and night-time in June

The typical June day in Kefalonia peaks at 24.8°C, but that is an average: the warmest 10% of days reach 27.6°C or more. Roughly 1 in 2 days top 25°C and 1 in 63 pass 30°C. Nights average 21.2°C; one night in ten drops to 18.8°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest June day here reached 33.0°C (2019-06-26) and the coldest night 14.5°C (2019-06-03).

Rain in June

Dry (3 rainy days or fewer): about 2 days with 1 mm or more, 11 mm in total. Year to year it varies a lot - the wettest June was 2018 with 94 mm, the driest 1995 with 0 mm. Humidity averages 79%.

Sea temperature in June

The sea averages 22.5°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.4°C to 23.4°C. For the warmest sea here, come in August (26.0°C).

Sunshine and daylight

Around 12.1 hours of sunshine a day (estimated from cloud cover), 14.6 hours of daylight: the sun rises about 06:14 and sets about 21:03 local time in mid-June. Average cloud cover is 18%.

Is June a good time to visit Kefalonia?

Yes - it is one of the better months: warm days, little rain and long sunny days. The best months for Kefalonia on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug, Sep.

Warm enough for summer clothes, but not reliably hot

Pack mainly light summer clothes, with a light layer for cooler evenings. June reaches 25°C on 45% of days, so expect comfortable warmth rather than consistently hot weather. Days reaching 30°C are uncommon at 2%, although hotter spells remain possible. With humidity at 79%, you may still prefer shade and a slower pace around midday, especially when walking. Average nights are mild, but the coldest 10% fall to 18.8°C or below, so an extra layer is sensible if you tend to feel chilly sitting outside. This balance suits travellers who want to spend time outdoors without relying on strong heat; dedicated heat-seekers may prefer July or August.

A good balance of swimming, sunshine and dry weather

The sea is warm enough for swimming on average, though it may feel fresh when you first get in. Its year-to-year June range is 21°C to 23°C, so anyone sensitive to cool water should allow for some variation rather than expect bath-like warmth. Rain is usually a minor interruption, with about 2 rainy days across the month, making outdoor plans a reasonable default. That is not a promise of an entirely dry stay, so keep some flexibility. Around 12.1 hours of sunshine within 14.6 hours of daylight leaves plenty of time outside. Use sun protection and take shade breaks; the long daylight also lets you shift walks towards the cooler parts of the day.