Weather in Kefalonia in July

How July compares

July is the 2nd warmest month of the year in Kefalonia and ranks 99th of 134 destinations we compare for July - see where else is hot in July. Within Greece it is 31st of 44 (Greece in July). Against London's average high of 21.8°C in July, Kefalonia is 5.3°C warmer by day and 10.1°C warmer at night.

Daytime and night-time in July

The typical July day in Kefalonia peaks at 27.1°C, but that is an average: the warmest 10% of days reach 29.2°C or more. About 91% of days top 25°C and 1 in 24 pass 30°C. Nights average 23.6°C; one night in ten drops to 21.8°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 37.0°C (2017-07-01) and the coldest night 17.4°C (1992-07-01).

Rain in July

Dry (3 rainy days or fewer): about 1 days with 1 mm or more, 5 mm in total. Year to year it varies a lot - the wettest July was 2002 with 54 mm, the driest 1993 with 0 mm. Humidity averages 78%.

Sea temperature in July

The sea averages 24.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 23.4°C to 25.6°C. For the warmest sea here, come in August (26.0°C).

Sunshine and daylight

Around 13.6 hours of sunshine a day (estimated from cloud cover), 14.4 hours of daylight: the sun rises about 06:27 and sets about 21:01 local time in mid-July. Average cloud cover is 6%.

Is July a good time to visit Kefalonia?

Yes - it is one of the better months: hot 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.

Reliable warmth, with little relief at night

July is among Kefalonia's warmest months, and the warmth is consistent: 91% of days reach 25°C. Yet days reaching 30°C account for just 4%, so the usual picture is hot rather than routinely above that threshold. Humidity averages 78%, which can make the warmth feel sticky, particularly when you are moving around. Put longer walks earlier in the day, keep midday plans gentle and pack loose, breathable clothes. Average night lows of 23.6°C mean evenings are still warm, so do not count on sunset bringing much relief. If you struggle to sleep in heat, air conditioning is a sensible accommodation priority.

Dry days that suit swimming and flexible plans

Rain is unlikely to shape most July holidays: there is about 1 rainy day during the month. That makes outdoor plans a reasonable bet, though dry averages are not a guarantee for your particular stay. Sunshine averages 13.6 hours a day, leaving plenty of scope to swim or spend time outside without putting everything into the hottest part of the day. Sunscreen, a hat and access to shade deserve more attention in your packing and planning than heavy waterproofs. The sea is comfortably in swimming territory, so July particularly suits travellers who want regular dips rather than those who prefer cool weather for sustained activity.