Santorini is worth visiting year-round, but timing makes a significant difference to your experience, the crowds you encounter and the prices you pay. Here is the full picture.
✔ Best overall: May–June and September
✔ Best value: April and October
✔ Most crowded: July–August (most crowded and expensive)
Month by Month — Santorini
January
Cool (10–15°C), Santorini almost entirely closed. Very few businesses open. Only for the experience of seeing the island deserted.
February
Similar to January. Some businesses beginning to open in Fira. Very quiet — almost no other tourists.
March
Warming (12–17°C), spring wildflowers, island awakening. Easter preparations. Some businesses still closed.
April
16–21°C, Santorini reopening, fewer crowds than summer. Oia still magical without the peak madness. Good prices.
May
20–25°C, sea warming, sailing tours and wineries open. Pre-peak prices — 30–40% below August. Outstanding.
June
24–28°C, Santorini summer in full swing, sailing tours, sunset spots getting busy. Book 4–6 weeks ahead.
July
27–32°C, peak season. Oia sunset 3,000+ people. Very expensive. Book 4–6 months ahead for caldera-view hotels.
August
28–33°C, busiest and most expensive month. Oia sunset overwhelming. Ferries packed. Book 5–6 months ahead.
September
25–29°C, sea at its warmest (26°C), crowds dropping sharply after mid-month. Often Santorini's best month.
October
20–24°C, very quiet, much cheaper, wine harvest atmosphere. Some businesses closing from mid-month. Beautiful light.
November
15–18°C, most businesses closed. Very quiet. Not recommended for first visits.
December
12–15°C, Santorini essentially closed for the season. Very few options for accommodation or dining.
Santorini Weather Summary
Santorini has a classic Mediterranean climate with an added volcanic dimension — the caldera creates its own microclimate. Summers are hot (26–33°C) and very dry. Winters are mild but most of the island closes November–March. The famous Meltemi wind blows in summer (July–August) — refreshing but can make boat trips rough. The sea temperature peaks at 26–27°C in September.
When Are Santorini Hotels Cheapest?
May and October are 40–50% cheaper than August for equivalent caldera-view properties. September is 20–30% below August peak. July–August caldera-view hotels require booking 4–6 months ahead. Properties away from the caldera are significantly cheaper at all times.
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Tours and hotels — compare before prices rise
Browse Santorini Tours →The Exact Weeks Worth Targeting
Last two weeks of May: The sweet spot before school holidays begin — sea is warm enough for confident swimmers, caldera hotels are still at spring pricing, and Oia's sunset crowd is manageable.
First two weeks of June: Similarly excellent, with slightly warmer water than late May and still well ahead of the July surge.
Second half of September: Arguably the single best window of the year — sea temperature peaks in early September and stays warm, while crowds and prices drop noticeably after the European school-return in early September.
Weeks to avoid if crowds matter: The last two weeks of July and all of August, when Oia's sunset viewpoint is at its most crowded and caldera hotel rates peak.
FAQs
What is the best month to visit Santorini?
May and September consistently — warm, sea swimmable, Oia sunsets manageable without the August chaos, prices 30–40% below peak.
Is Santorini worth visiting in October?
Yes for the quieter, more authentic experience and the autumn light on the caldera. Many businesses close mid-October. Wineries are in harvest mode — excellent for wine tourism.
When should I book Santorini hotels?
Caldera-view hotels in July–August: 4–6 months ahead. May, June and September caldera views: 2–3 months ahead. Properties away from the caldera: much more flexible.
Is late September too late for swimming?
No — the Aegean retains its summer warmth well into late September and often into early October, making it one of the most underrated swimming windows of the year.