Weather in Kos in July

How July compares

July is the 2nd warmest month of the year in Kos and ranks 105th of 134 destinations we compare for July - see where else is hot in July. Within Greece it is 33rd of 44 (Greece in July). Against London's average high of 21.8°C in July, Kos is 5.0°C warmer by day and 10.4°C warmer at night.

Daytime and night-time in July

The typical July day in Kos peaks at 26.8°C, but that is an average: the warmest 10% of days reach 29.4°C or more. About 87% of days top 25°C and 1 in 13 pass 30°C. Nights average 23.9°C; one night in ten drops to 22.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 35.3°C (2017-07-01) and the coldest night 19.6°C (2011-07-01).

Rain in July

Dry (3 rainy days or fewer): about 0 days with 1 mm or more, 0 mm in total. Year to year it varies a lot - the wettest July was 2019 with 3 mm, the driest 1991 with 0 mm. Humidity averages 72%.

Sea temperature in July

The sea averages 23.8°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.8°C to 24.6°C. For the warmest sea here, come in August (25.2°C).

Sunshine and daylight

Around 14.1 hours of sunshine a day (estimated from cloud cover), 14.3 hours of daylight: the sun rises about 06:03 and sets about 20:30 local time in mid-July. Average cloud cover is 1%.

Is July a good time to visit Kos?

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

Warmth that lasts into the evening

July is among the warmest months in Kos, but temperatures above 30°C are not the everyday pattern. Days reach 25°C on 87% of occasions, while 8% reach 30°C, so expect consistent warmth rather than assume extreme heat throughout your stay. Humidity averages 72%, which can make the warmth feel less comfortable, particularly when you are active. Plan more demanding outdoor time for the morning, leave room for shade at midday, and choose light, loose clothing. Nights offer relatively little relief, so cooling in your accommodation is a sensible priority if you struggle to sleep in warm conditions. Evening outfits can stay light too.

Swimming weather with little need for a rain plan

The sea is warm enough for swimming, with July temperatures ranging from 23°C to 25°C across years. That makes Kos a good choice if time in the water matters more to you than cool conditions on land. Rainy days are about 0, so rain is unlikely to shape your plans, although that is not a guarantee of completely dry weather. Sunshine averages about 14.1 hours a day, leaving plenty of scope to move outdoor time away from midday. Pack sunscreen, sunglasses and a hat, and treat shade as part of the plan rather than an afterthought. A rain-focused packing list is less useful than preparing for prolonged sunshine.