Weather in Skiathos in July

How July compares

July is the 2nd warmest month of the year in Skiathos and ranks 113th of 134 destinations we compare for July - see where else is hot in July. Within Greece it is 39th of 44 (Greece in July). Against London's average high of 21.8°C in July, Skiathos is 4.2°C warmer by day and 10.6°C warmer at night.

Daytime and night-time in July

The typical July day in Skiathos peaks at 26.0°C, but that is an average: the warmest 10% of days reach 27.6°C or more. About 80% of days top 25°C and 1 in 100 pass 30°C. Nights average 24.1°C; one night in ten drops to 22.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 31.8°C (2000-07-09) and the coldest night 18.8°C (1991-07-01).

Rain in July

Dry (3 rainy days or fewer): about 2 days with 1 mm or more, 17 mm in total. Year to year it varies a lot - the wettest July was 2006 with 80 mm, the driest 2012 with 0 mm. Humidity averages 73%.

Sea temperature in July

The sea averages 25.4°C - warm enough to swim (22°c+). Depending on the year it ranges from 24.5°C to 26.1°C. For the warmest sea here, come in August (26.3°C).

Sunshine and daylight

Around 13.0 hours of sunshine a day (estimated from cloud cover), 14.5 hours of daylight: the sun rises about 06:12 and sets about 20:52 local time in mid-July. Average cloud cover is 10%.

Is July a good time to visit Skiathos?

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

Warm days, with little cooling after sunset

Skiathos is noticeably warmer than London in July, with average daytime highs 4.2°C higher. Temperatures reach 25°C on 80% of days, so light summer clothing should be the mainstay of your packing. Days reaching 30°C are uncommon, but that does not make midday a good time for sustained exertion: shade and breaks are still sensible. The bigger consideration is overnight comfort. Average lows are 24°C, while humidity is 73%, so do not expect a distinctly cool reset after sunset. If you struggle to sleep in warm conditions, prioritise accommodation with cooling. July suits you better if you like consistently warm evenings than if you rely on cooler nights to recover from the heat.

Good swimming conditions and plenty of outdoor time

The sea is warm enough for comfortable swimming, averaging 25.4°C, with a year-to-year range of 24°C to 26°C. That makes July a sensible choice if time in the water is central to your holiday rather than an occasional extra. Sunshine averages about 13 hours a day, leaving plenty of scope to move outdoor plans away from midday. Bring sun protection and clothing that gives you cover without trapping too much heat. Rain is usually a minor interruption rather than a reason to avoid the month: about 2 days receive measurable rain. Still, dry does not mean guaranteed rain-free, so keep plans flexible if a shower arrives. For a swimming-focused trip, the balance is strongly in July's favour.