Weather in Santorini in July

How July compares

July is the 2nd warmest month of the year in Santorini and ranks 119th of 134 destinations we compare for July - see where else is hot in July. Within Greece it is 44th of 44 (Greece in July). Against London's average high of 21.8°C in July, Santorini is 3.5°C warmer by day and 8.6°C warmer at night.

Daytime and night-time in July

The typical July day in Santorini peaks at 25.3°C, but that is an average: the warmest 10% of days reach 27.3°C or more. About 54% of days top 25°C and 1 in 56 pass 30°C. Nights average 22.1°C; one night in ten drops to 20.6°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 33.6°C (2017-07-02) and the coldest night 17.8°C (1992-07-04).

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 2017 with 2 mm, the driest 1991 with 0 mm. Humidity averages 72%.

Sea temperature in July

The sea averages 23.7°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 (24.6°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 06:12 and sets about 20:36 local time in mid-July. Average cloud cover is 1%.

Is July 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 reliably extreme heat

July is among Santorini's warmest months, but the figures suggest warmth rather than relentless extreme heat. Days reach 25°C on 54% of occasions, while 30°C is reached on just 2%. That makes it a reasonable choice if you enjoy hot-weather holidays but do not want very high temperatures to be the norm. Humidity averages 72%, so the air may still feel sticky, particularly when you are active. Keep more energetic plans for the cooler parts of the day and leave room for shade at midday. Light, breathable clothing makes sense, and with average night lows of 22.1°C, you should not expect evenings to provide a sharp cool-down.

Good swimming weather, with little need for a rain plan

The sea averages 23.7°C, which puts July comfortably in swimming territory rather than bracing-dip territory. Its year-to-year range of 23°C to 25°C also makes this a sensible month if getting into the water matters more to you than simply sitting beside it. Rain is unlikely to shape your plans, with about 0 rainy days, though that is not a guarantee that every day will stay dry. Pack primarily for sunshine: swimwear, light clothes, a hat, sunglasses and sun cream deserve priority over wet-weather gear. The practical catch is that such dry, sunny conditions call for deliberate shade breaks, not just waiting for cloud or rain to give you a rest.