Weather in Santorini in August

How August compares

August is the 1st warmest month of the year in Santorini and ranks 123rd of 134 destinations we compare for August - see where else is hot in August. Within Greece it is 44th of 44 (Greece in August). Against London's average high of 21.4°C in August, Santorini is 4.2°C warmer by day and 9.1°C warmer at night.

Daytime and night-time in August

The typical August day in Santorini peaks at 25.6°C, but that is an average: the warmest 10% of days reach 27.5°C or more. About 66% of days top 25°C and 1 in 167 pass 30°C. Nights average 22.6°C; one night in ten drops to 21.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 31.4°C (2020-08-01) and the coldest night 18.8°C (2000-08-29).

Rain in August

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 August was 2018 with 6 mm, the driest 1992 with 0 mm. Humidity averages 73%.

Sea temperature in August

The sea averages 24.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 23.8°C to 25.8°C. This is the warmest the sea gets here all year.

Sunshine and daylight

Around 13.2 hours of sunshine a day (estimated from cloud cover), 13.4 hours of daylight: the sun rises about 06:36 and sets about 20:09 local time in mid-August. Average cloud cover is 2%.

Is August a good time to visit Santorini?

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

Warm days without frequent extreme heat

August suits travellers who want warmth that lasts into the evening, rather than cool nights after a sunny day. Temperatures reach 25°C on 66% of days, while 30°C is reached on just 1%, so very hot afternoons are not the usual pattern. Humidity averages 73%, which can make the warmth feel less comfortable than the temperature alone suggests. Choose loose, breathable clothing and keep strenuous outdoor plans away from midday. Evenings generally call for light clothes rather than heavy layers, though a light extra layer is sensible if you tend to feel chilly. Prioritise accommodation where you can sleep comfortably in warm conditions.

Reliable outdoor weather and a swimmable sea

Rain is unlikely to dictate your plans in August: there are about 0 rainy days, so this is a strong choice if wet weather would spoil your holiday. That does not make a shower impossible, but waterproofs need not dominate your packing. Sunshine averages about 13.2 hours out of 13.4 hours of daylight, making sun protection and access to shade more useful everyday priorities. The sea is comfortably within the swimming range, with August averages varying from 24°C to 26°C between years. This suits a holiday built around swimming and time outdoors, provided you are happy to take breaks from the sun rather than stay exposed throughout the day.