Weather in Athens in May

How May compares

May is the 5th warmest month of the year in Athens and ranks 54th of 134 destinations we compare for May - see where else is hot in May. Within Greece it is 7th of 44 (Greece in May). Against London's average high of 16.6°C in May, Athens is 8.6°C warmer by day and 7.0°C warmer at night.

Daytime and night-time in May

The typical May day in Athens peaks at 25.2°C, but that is an average: the warmest 10% of days reach 29.9°C or more. About 52% of days top 25°C and 1 in 10 pass 30°C. Nights average 15.3°C; one night in ten drops to 12.1°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest May day here reached 35.9°C (1994-05-26) and the coldest night 8.4°C (2006-05-06).

Rain in May

Some rain (4-8 rainy days): about 5 days with 1 mm or more, 23 mm in total. Year to year it varies a lot - the wettest May was 1993 with 55 mm, the driest 2006 with 4 mm. Humidity averages 60%.

Sea temperature in May

The sea averages 18.8°C - bracing (18-22°c). Depending on the year it ranges from 17.7°C to 19.5°C. For the warmest sea here, come in August (26.3°C).

Sunshine and daylight

Around 9.3 hours of sunshine a day (estimated from cloud cover), 14.1 hours of daylight: the sun rises about 06:15 and sets about 20:28 local time in mid-May. Average cloud cover is 34%.

Is May a good time to visit Athens?

Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Athens on our scoring are June, September, May; months averaging 25°C or more: May, Jun, Jul, Aug, Sep.

Warm days, with occasional hotter spells

Athens in May suits travellers who enjoy warmth but do not want to plan their whole day around avoiding heat. Days reach 25°C about 52% of the time, while 30°C is reached on 10% of days. That makes a hot afternoon a realistic possibility, rather than something to expect throughout your stay. Keep more energetic walking for the morning on hotter days, and leave room for shade and breaks around midday. Lightweight, breathable clothing is a useful starting point, along with sunglasses, sunscreen and water. Evenings are cooler, so an extra layer earns its place in your bag even when the daytime forecast looks warm.

Plenty of light, but leave room for rain

With about 9.3 hours of sunshine across 14.1 hours of daylight, May gives you plenty of scope to spend time outdoors without squeezing everything into the hottest part of the day. Long daylight hours also make it easier to pause at midday and head out again later. Rain is still part of the picture, with about 5 rainy days during the month, so a completely dry trip is not guaranteed. Pack a light waterproof or compact umbrella and keep your plans flexible. The balance favours outdoor time, but checking the forecast before committing to a full day outside is sensible.

Better for city warmth than leisurely swimming

The sea is the main reason to temper expectations of a summer-style holiday. Its average temperature is 18.8°C, with a year-to-year range of 18°C to 20°C, which puts it firmly in bracing territory. If you are comfortable with cool water, a swim may appeal; if you like to linger in comfortably warm water, May is less convincing. Do not let a hot afternoon fool you into expecting equally warm sea conditions. For a trip centred on walking, outdoor meals and enjoying the daylight, the weather is a better fit. Treat swimming as an optional extra rather than the reason to book.