Weather in Kos in June

How June compares

June is the 4th warmest month of the year in Kos and ranks 97th of 134 destinations we compare for June - see where else is hot in June. Within Greece it is 29th of 44 (Greece in June). Against London's average high of 19.6°C in June, Kos is 5.2°C warmer by day and 10.4°C warmer at night.

Daytime and night-time in June

The typical June day in Kos peaks at 24.8°C, but that is an average: the warmest 10% of days reach 27.7°C or more. Roughly 1 in 2 days top 25°C and 1 in 43 pass 30°C. Nights average 21.7°C; one night in ten drops to 19.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest June day here reached 34.4°C (2017-06-30) and the coldest night 15.4°C (2020-06-02).

Rain in June

Dry (3 rainy days or fewer): about 1 days with 1 mm or more, 2 mm in total. Year to year it varies a lot - the wettest June was 2020 with 22 mm, the driest 1992 with 0 mm. Humidity averages 74%.

Sea temperature in June

The sea averages 22.2°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.3°C to 23.2°C. For the warmest sea here, come in August (25.2°C).

Sunshine and daylight

Around 13.3 hours of sunshine a day (estimated from cloud cover), 14.5 hours of daylight: the sun rises about 05:51 and sets about 20:32 local time in mid-June. Average cloud cover is 9%.

Is June a good time to visit Kos?

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

Warm days and mild evenings, rather than constant heat

Kos in June suits travellers who want to spend time outdoors but do not need very hot afternoons. Days reach 25°C about 41% of the time, while 30°C is reached on just 2% of days. That makes warmth a better expectation than fierce heat, though hotter spells remain possible. Humidity averages 74%, so the air can feel close; loose, breathable clothing is a sensible choice. Average night lows are around 22°C, which makes light evening clothing practical. Pack a light layer for cooler nights rather than assuming every evening will feel equally warm. Keep more active plans away from midday if you find sunshine tiring.

Good swimming prospects and long, sunny days

The sea is warm enough for swimming on average, but personal tolerance still matters. Its June average is 22.2°C, with a year-to-year range of 21°C to 23°C, so expect an initial cool feel rather than bath-like warmth. This suits travellers happy to get moving in the water; anyone sensitive to cooler seas may prefer shorter swims. With 14.5 hours of daylight and sunshine through much of it, there is plenty of flexibility to swim or spend time outside later in the day. You do not need to squeeze everything into the brightest midday hours. Bring sunglasses, sunscreen and something that covers your shoulders for longer stretches outdoors.