Weather in Mykonos in May

How May compares

May is the 6th warmest month of the year in Mykonos and ranks 114th of 134 destinations we compare for May - see where else is hot in May. Within Greece it is 34th of 44 (Greece in May). Against London's average high of 16.6°C in May, Mykonos is 3.7°C warmer by day and 8.8°C warmer at night.

Daytime and night-time in May

The typical May day in Mykonos peaks at 20.3°C, but that is an average: the warmest 10% of days reach 22.9°C or more. Roughly 1 in 53 days top 25°C. Nights average 17.1°C; one night in ten drops to 14.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest May day here reached 29.3°C (2018-05-19) and the coldest night 11.8°C (2006-05-09).

Rain in May

Dry (3 rainy days or fewer): about 2 days with 1 mm or more, 10 mm in total. Year to year it varies a lot - the wettest May was 2007 with 54 mm, the driest 1999 with 0 mm. Humidity averages 76%.

Sea temperature in May

The sea averages 18.1°C - bracing (18-22°c). Depending on the year it ranges from 17.3°C to 19.1°C. For the warmest sea here, come in August (24.3°C).

Sunshine and daylight

Around 10.3 hours of sunshine a day (estimated from cloud cover), 14.0 hours of daylight: the sun rises about 06:10 and sets about 20:21 local time in mid-May. Average cloud cover is 26%.

Is May a good time to visit Mykonos?

It is a reasonable choice: warm days. The best months for Mykonos on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.

Comfortable warmth, with a layer for evenings

Daytime weather is better suited to walking and sitting outside than relying on intense heat for sunbathing. Only 2% of days reach 25°C, so a genuinely hot afternoon is the exception rather than the expectation. The warmer days reach 22.9°C or more, while cooler nights can fall to 14.9°C or below. Light clothes make sense during the day, but bring a jumper or light jacket for evenings and trousers if you feel the cold. There is little reason to organise your whole day around avoiding midday heat, though sunshine still calls for sun protection.

Mostly dry, with plenty of daylight

Rain is unlikely to be the main drawback of a May trip. There are about 2 rainy days during the month, making outdoor plans a reasonable starting point, though a completely dry stay is not guaranteed. Around 10.3 hours of sunshine within 14.0 hours of daylight gives you plenty of scope to spend time outside without cramming everything into the middle of the day. A light waterproof is a sensible backup rather than the focus of your packing. The useful distinction is that May offers plenty of sun, but sunshine does not necessarily mean hot air or warm water.

The sea is the main compromise

At 18.1°C, the sea is bracing rather than comfortably warm. The year-to-year range of 17°C to 19°C means you should not book on the assumption that an unusually mild May will bring warm-water swimming. If you are used to cool water, a brief dip may appeal; if you like to linger in the sea, this is a clear drawback. A beach-focused break can still suit someone happy to sit in the sun and swim only occasionally. Bring something warm to put on afterwards, and judge the trip on its outdoor weather rather than expecting the sea to feel summery.