Weather in Mykonos in July

How July compares

July is the 2nd warmest month of the year in Mykonos and ranks 110th of 134 destinations we compare for July - see where else is hot in July. Within Greece it is 37th of 44 (Greece in July). Against London's average high of 21.8°C in July, Mykonos is 4.4°C warmer by day and 9.8°C warmer at night.

Daytime and night-time in July

The typical July day in Mykonos peaks at 26.2°C, but that is an average: the warmest 10% of days reach 28.1°C or more. About 81% of days top 25°C and 1 in 42 pass 30°C. Nights average 23.3°C; one night in ten drops to 21.7°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 34.4°C (2017-07-02) and the coldest night 19.1°C (1992-07-03).

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 2018 with 3 mm, the driest 1991 with 0 mm. Humidity averages 72%.

Sea temperature in July

The sea averages 23.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.3°C to 24.7°C. For the warmest sea here, come in August (24.3°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 06:10 and sets about 20:40 local time in mid-July. Average cloud cover is 2%.

Is July a good time to visit Mykonos?

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

Hot days, with little cooling after dark

Expect reliably warm days rather than routine extreme heat. Temperatures reach 25°C on 81% of days, while only 2% reach 30°C, so July is a reasonable choice if you like summer warmth but would rather avoid very high temperatures. That is not a guarantee against a hotter spell. Average night lows are 23°C, which means outdoor evenings should feel warm, but sleeping conditions deserve some thought: prioritise accommodation with cooling if you struggle in warm bedrooms. Humidity averages 72%, so do not assume the lack of rain means a crisp, dry feel. Keep clothing light and breathable, and put more energetic plans earlier in the day rather than at midday.

Dry weather and a sea that suits swimming

Rain is unlikely to shape your plans: July averages about 0 rainy days. That makes it a good fit for travellers who dislike rearranging outdoor time around showers, though it is not a promise that rain cannot happen. The bigger practical concern is prolonged sunshine. Pack sunscreen, sunglasses and a hat, and make room for shade rather than treating every daylight hour as time to spend in the sun. Sea temperatures average 23.6°C, with a year-to-year range of 22°C to 25°C. That puts swimming comfortably on the agenda, although your preference for warmer water still matters. Choose July for regular swims and warm evenings, not for a cooling break from summer heat.