The best time to visit Santorini is May to June and September to October, when the weather is warm and sunny, the sea swimmable and the crowds far thinner than the July and August peak. September is many travellers’ top choice. This guide covers the seasons month by month, the crowds, the winds and when to go.
Choosing the right time shapes the whole trip, a key step in the wider Santorini travel guide. The island’s summers are hot, dry and busy. The sections below cover the seasons.
When is the overall best time?
The overall best time is May to June and September to October, when the weather is warm, the sea swimmable and both crowds and prices below the midsummer peak. Mid to late September is the consensus best, keeping summer warmth as the crowds thin.
The shoulder months offer the finest balance on Santorini. Late spring, into June, brings warm, sunny days, blooming hillsides and a sea warming to swimmable temperatures, with everything open as the season builds. Early autumn, September into October, keeps summer-like warmth and a sea still warm from the long summer, but with noticeably thinner crowds after the first week of September and falling prices, which is why mid to late September is so often named the best time of all.
Both seasons avoid the intense heat, crush and high costs of midsummer while keeping the island fully alive, with tavernas, tours and ferries all running. They also give softer light for photography and cooler days for the caldera walk and the archaeological sites. Hotel rates in these months run well below the August ceiling, and the famous sunset viewpoints in Oia are far easier to reach without a long wait, set out alongside the guide to things to do in Santorini and the weather. Each season has its own character.
What is spring like, April to May?
Spring, from April to May, is mild and green, with temperatures climbing from the high teens to the mid-20s Celsius, wildflowers on the hills and quiet streets. It is ideal for sightseeing, hiking and the villages, though the sea is still cool early on.
Spring is Santorini at its calmest and freshest. After the winter rains, the hillsides are green and dotted with wildflowers, and daytime temperatures rise from the high teens in April to the mid-20s Celsius by late spring, comfortable for exploring. The villages, the caldera path and Akrotiri are a pleasure without the summer crowds or heat, and prices sit well below peak.
The main caveat is the sea, still cool for swimming in April and warming to a swimmable 20 to 22 degrees only by late spring or early June. Easter, which falls in spring, brings vivid local celebrations in villages like Pyrgos and is a rewarding time to see island tradition, though some services pause over the holiday. For sightseeing, hiking and photography in peace, spring is excellent, set out alongside the guide to the Santorini sunset and Santorini in June. Summer brings the heat and the crowds.
What is summer like, June to August?
Summer is hot, dry and sunny, with highs around the high 20s in June rising to 30 degrees or more in July and August, and warm seas. It is peak season for beaches and cruises, but also the busiest and most expensive.
Summer is the peak, bright and lively but intense. June already brings warm, settled weather in the high 20s and the start of the beach season, while July and August are the hottest months, regularly reaching 30 degrees or more, with reliably sunny days and warm, swimmable seas. This is prime time for the black-sand beaches, caldera cruises and watersports.
It is also the busiest and priciest, with Oia and Fira crowded, accommodation at its dearest and the Oia sunset packed an hour or more ahead. The cooling meltemi wind picks up in high summer, occasionally affecting ferries, so booking everything well ahead is essential and an early or evening start beats the midday heat, set out alongside the guides to where to stay in Santorini and Santorini in August. Autumn keeps the warmth with calm.
What is autumn and winter like?
Autumn stays warm into October, ideal for swimming and sightseeing as crowds and prices drop, before cooling in November. Winter, from November to March, is mild but cool and the rainiest season, with the sea too cold to swim and some places closed.
The year winds down gently before the quiet of winter. September still feels like summer, warm with a sea kept warm from the heat, and October remains pleasant for swimming early on and excellent for sightseeing as the island empties and prices fall, making early autumn many travellers’ favourite. The light turns golden and the caldera walk is a joy in the cooler air.
From November the weather cools and the rains arrive, and through winter, from November to March, temperatures sit around 10 to 14 degrees, the sea is too cold to swim and a number of hotels, restaurants and attractions close. The island stays mild compared with northern Europe and almost crowd-free, so it suits travellers after quiet and low prices over beach weather, and Christmas and New Year bring a small festive buzz to Fira, set out alongside the guides to a Santorini itinerary and Santorini in October. The crowds and winds are worth understanding.
How busy is Santorini, and what is the meltemi?
Santorini is busiest in July and August, around 95 to 100 per cent full, easing to about 85 per cent in September and 80 in June. The meltemi is a strong, dry north wind of high summer that cools the heat but can disrupt ferries.
Crowds and wind both peak in high summer. The island is at its absolute busiest in August, essentially full, with July close behind, before easing to around 85 per cent in September as the heat softens and 80 per cent in June at the start of beach season. Spring and late autumn are quieter still, and the shoulder months strike the balance most travellers want between warmth, cost and space.
The other midsummer factor is the meltemi, a strong, dry northerly wind that blows mainly in July and August. It brings welcome relief from the heat and clear skies, but can whip up the sea, occasionally delaying or cancelling ferries and making the exposed east-coast beaches choppy. Travelling in the shoulder months sidesteps both extremes, set out alongside the guide to how to get to Santorini and Santorini in September. The questions below cover the points travellers ask most.
When to book, and how long to stay?
Book caldera-view hotels and popular tours three to six months ahead for the summer peak, and earlier still for August. Most visitors find three to four nights enough for the main sights, sunset, a boat trip and a beach or wine day.
Timing your booking matters as much as timing your trip. The best caldera-view rooms in Oia, Imerovigli and Fira sell out months in advance for July and August, so booking three to six months ahead secures both choice and better rates, and popular sunset cruises and volcano tours fill quickly in peak weeks. In the shoulder months you can book closer to travel, though the top hotels still go early.
For length of stay, three to four nights suit most first-time visitors, enough to see Oia and Fira, watch a sunset, take a caldera boat trip and spend a day on the beaches or at a winery. Add a night for the archaeological sites at Akrotiri and ancient Thera or a ferry day trip to a neighbouring island, set out alongside the guides to a 3-day itinerary and day trips. The questions below cover the points travellers ask most.
Frequently Asked Questions
What is the best month to visit Santorini?
September is widely considered the best month to visit Santorini, keeping summer warmth and a swimmable sea while the crowds thin and prices fall. May, June and early October are also excellent, with warm weather and far fewer people than the July and August peak.
When is Santorini least crowded?
Santorini is least crowded in spring, from April to May, and in late autumn from mid-October, outside the peak. The shoulder months of May, June and September offer pleasant weather with manageable crowds, while July and August are the busiest and most expensive.
What is the meltemi wind in Santorini?
The meltemi is a strong, dry north wind that blows mainly in July and August. It cools the summer heat and clears the skies, but can whip up the sea, occasionally delaying or cancelling ferries and making the exposed east-coast beaches choppy on windy days.
When is the sea warm enough to swim in Santorini?
The sea in Santorini is warm enough to swim from about late spring, reaching a comfortable 24 to 25 degrees through July, August and September, and still pleasant into October. In early spring the water is cool, and through winter it is too cold for most swimmers.