Weather in Skiathos in August

How August compares

August is the 1st warmest month of the year in Skiathos and ranks 112th of 134 destinations we compare for August - see where else is hot in August. Within Greece it is 37th of 44 (Greece in August). Against London's average high of 21.4°C in August, Skiathos is 5.2°C warmer by day and 11.2°C warmer at night.

Daytime and night-time in August

The typical August day in Skiathos peaks at 26.6°C, but that is an average: the warmest 10% of days reach 28.2°C or more. About 90% of days top 25°C and 1 in 200 pass 30°C. Nights average 24.7°C; one night in ten drops to 22.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 32.4°C (1994-08-12) and the coldest night 18.4°C (1991-08-31).

Rain in August

Dry (3 rainy days or fewer): about 3 days with 1 mm or more, 20 mm in total. Year to year it varies a lot - the wettest August was 1991 with 82 mm, the driest 1998 with 0 mm. Humidity averages 71%.

Sea temperature in August

The sea averages 26.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 25.4°C to 27.0°C. This is the warmest the sea gets here all year.

Sunshine and daylight

Around 12.1 hours of sunshine a day (estimated from cloud cover), 13.5 hours of daylight: the sun rises about 06:39 and sets about 20:22 local time in mid-August. Average cloud cover is 10%.

Is August 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 dark

Expect reliably warm weather rather than a holiday that depends on catching the occasional hot day: 90% of days reach 25°C. Light, loose clothing makes sense, and the middle of the day is a sensible time to seek shade rather than plan anything strenuous. Humidity averages 71%, so the warmth may feel sticky, particularly if you prefer dry heat. Evenings offer only a small drop in temperature, making outdoor meals comfortable for warmth lovers but bedtime less appealing without cooling. If you tend to sleep badly in the heat, prioritise accommodation with air conditioning rather than assuming an open window will be enough.

Sea temperatures that make swimming appealing

The sea is a strong reason to choose August. Its average temperature is close to the daytime air temperature, so swimming should feel warm rather than bracing. The year-to-year range is 25°C to 27°C, which supports choosing this month if cold water usually puts you off. Do not expect the sea to provide an icy reset from the heat, though: it is more about comfortable swimming than a sharp cool-down. Pack swimwear you can use regularly, along with a cover-up for time out of the water. Temperature alone does not tell you about waves or currents, so check conditions before going in.

Plenty of sunshine, little need to plan around rain

With about 12.1 hours of sunshine a day, August gives you plenty of scope to spend time outside without concentrating everything around midday. Earlier or later outings are a sensible choice if you find sustained sunshine tiring, leaving the hottest part of the day for shade and a slower pace. There are about 2 rainy days across the month, so wet weather is unlikely to be the main constraint on your plans. That is not a promise of an entirely dry stay, however. Keep plans flexible if rain arrives, but give sun protection, a hat and light clothing more packing space than heavy waterproofs.