The Best Time to Visit Athens

Spring: April and May

Mean daily temperatures sit around 16°C in April and 20°C in May, and the long site hours return on 1 April. The hills are green, which matters more than it sounds if you are taking Delphi or the Argolid, where bare rock in August and wild flowers in April are two different trips. The variable is Orthodox Easter.

It moves each year, the state sites shut on Easter Sunday, and the week around it fills roads and hotels as the whole country travels. A Western Easter date tells you nothing about the Greek one, and a trip booked blind can land in the middle of the holiday. Check the Orthodox date for your year before you book anything, and either avoid that week or join it deliberately.

Summer: June to August

The daily mean runs close to 28°C, rain is rare, and the Acropolis offers no shade at all. The practical answer is to accept the shape summer forces on the day. Sites before half past ten and after half past five, museums, lunch and a nap in the middle hours.

In a declared heatwave the ministry has repeatedly closed the open-air sites from roughly midday to 17:00, and the announcement can come a day or less in advance, so keep a museum in reserve. August adds Greek holidays, some businesses close, and locals leave the city. Do the heavy outdoor walking early, carry water, and read Athens in the heat before you fix a schedule.

Autumn: September and October

This is the best combination the year offers. From mid-September the heat breaks, the site hours are still long, and the sea stays warm enough for an island day, where the ferries run all year. The last weekend of September is one of the free state-site days, which in good weather means queues as well as savings, so arrive early.

October steps the hours down towards the winter timetable but stays comfortable to the end of the month. Practical note: the sea is at its best early in the season, so if an island swim is part of the plan, September beats late October. The heat of August is gone, the winter rain has not started, and the city belongs to the visitors who read the calendar properly.

Winter: November to March

This is the wet season. November and December are the two wettest months by a distance, so pack for rain rather than cold. Hours shrink from 1 November: the Olympieion, Roman Agora, Kerameikos and Aristotle's Lyceum close at 15:00 while the Acropolis runs to 17:00.

Against that you get the lowest hotel rates of the year, no queues anywhere, two free-entry Sundays a month at the state sites, and the Acropolis Museum open to 22:00 on Fridays. The small outdoor sites at 15:00 actually fit a museum-heavy day well, since you can finish outside by mid-afternoon and move indoors. For a trip built around museums rather than hilltop ruins, winter is genuinely the best time to come.

Orthodox Easter

Orthodox Easter moves each year and usually falls on a different Sunday from the Western date, because it is set by a different calendar and calculation. The consequences are practical. The state sites close on Easter Sunday.

The Acropolis Museum keeps short hours on Good Friday and Holy Saturday. And the whole country travels, as Greeks leave the cities for family villages, so buses, ferries and trains are full and hotel prices rise in the days around the feast. A trip booked around a Western Easter can land directly on the Greek one, which surprises visitors every year.

Either avoid that week entirely or plan for it, because the date changes annually and no season label will protect you from it.

The free days

The state sites waive entry on 6 March, 18 April, 18 May, the last weekend of September, 28 October, and the first and third Sunday of each month from 1 November to 31 March. The Acropolis Museum has its own separate list, on 6 March, 25 March, 18 May and 28 October, because it is a separate legal entity from the state sites. A February Sunday is a gift, with short queues and the Acropolis almost to yourself at opening. 18 May in warm weather is different, and the free weekend in September draws the same crowd, so go at opening time.

Note that paid tickets bought for those days are simply wasted, so plan your paid visits around the calendar. The free-entry page weighs each date.

15 August and the holidays

15 August, the Dormition, is a national holiday and much of Greece leaves the cities for islands and villages. Expect closures of shops and services in Athens, and full ferries heading the other way. The two other big national holidays are 25 March and 28 October, both marked with parades. 25 March is the awkward one for sightseeing, because it closes the state sites for the day while the Acropolis Museum, on its own calendar, gives free entry, which makes that a museum day by necessity. 28 October sits on the state-site free list, so the sites open and cost nothing, with crowds to match.

Plan the parade-watching or the museum around the closures rather than discovering them at a ticket gate.

Strikes

Strikes are not seasonal and cannot be predicted more than a few days out. By law, unions must give at least 24 hours' notice, and four days where a public utility or public service is involved, so you get some warning but not much. There is no official English calendar.

Notices appear in Greek on apergia.gr and service notices on OASA. They stop transport and can close state sites outright, since those are staffed by ministry employees and a public-sector walkout shuts the Acropolis with them. Hellenic Heritage tickets are non-refundable, and the defence on offer is two changes per ticket up to two hours before the slot, so if a strike is announced, move the booking rather than lose it. The strikes page explains the detail.