Weather in Mykonos in December

How December compares

December is the 10th warmest month of the year in Mykonos and ranks 88th of 134 destinations we compare for December - see where else is hot in December. Within Greece it is 26th of 44 (Greece in December). Against London's average high of 7.7°C in December, Mykonos is 6.8°C warmer by day and 9.2°C warmer at night.

Daytime and night-time in December

The typical December day in Mykonos peaks at 14.5°C, but that is an average: the warmest 10% of days reach 17.7°C or more. Days over 25°C are rare. Nights average 11.9°C; one night in ten drops to 8.2°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest December day here reached 20.7°C (2010-12-02) and the coldest night 4.2°C (2015-12-31).

Rain in December

Wet (more than 8 rainy days): about 10 days with 1 mm or more, 69 mm in total. Year to year it varies a lot - the wettest December was 2003 with 138 mm, the driest 2006 with 6 mm. Humidity averages 72%.

Sea temperature in December

The sea averages 16.7°C - too cold for most (under 18°c). Depending on the year it ranges from 15.8°C to 17.6°C. For the warmest sea here, come in August (24.3°C).

Sunshine and daylight

Around 4.2 hours of sunshine a day (estimated from cloud cover), 9.4 hours of daylight: the sun rises about 07:26 and sets about 17:02 local time in mid-December. Average cloud cover is 55%.

Is December a good time to visit Mykonos?

December is not the strongest month here: cool days and frequent rain. The best months for Mykonos on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.

Milder days, but keep your layers

The daytime average can make being outdoors comfortable with suitable clothing, but it is not dependable T-shirt weather. Warmer days can reach 17.7°C or more, while the average night low is 11.9°C. Colder nights can fall to 8.2°C or below, so bring a jumper and a jacket rather than packing only for the daytime forecast. There is about 4.2 hours of sunshine within 9.4 hours of daylight, leaving limited scope for long, sun-filled days. Make the most of brighter periods for time outdoors and keep evenings flexible. December works better for travellers content with cool conditions than for anyone seeking dependable heat.

Plan around rain and a cold sea

With about 10 rainy days, wet weather is a meaningful part of a December visit, although that does not mean rain lasts all day. A waterproof outer layer is more useful than relying on sunshine, and shoes that cope with wet conditions will make outdoor plans easier. Keep your schedule flexible enough to move time outdoors into clearer spells. The sea is another reason to adjust expectations: at 16.7°C on average, it is cold rather than comfortably swimmable. If you want relaxed bathing, this is not a good match. December is better suited to time beside the water in layers than to spending much of the day in it.