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Best time to visit Syros: month by month
Short answer
June and September are the best months, with highs of about 26°C, a warm sea and fewer visitors. July and August are the hottest (about 29°C) and windiest months; unlike most of the Cyclades, Syros stays open all year.
Month by month
| Month | High | Low | Rainy days | Crowds |
|---|---|---|---|---|
| Jan | 15°C | 11°C | 12 | low |
| Feb | 14°C | 10°C | 7 | low |
| Mar | 15°C | 10°C | 8 | low |
| Apr | 18°C | 13°C | 5 | low |
| May | 22°C | 17°C | 3 | medium |
| Jun | 26°C | 21°C | 2 | medium |
| Jul | 29°C | 24°C | 0 | high |
| Aug | 29°C | 25°C | 2 | very high |
| Sep | 26°C | 22°C | 2 | medium |
| Oct | 22°C | 19°C | 2 | low |
| Nov | 20°C | 16°C | 6 | low |
| Dec | 17°C | 13°C | 9 | low |
Temperatures and rainy days: Copernicus ERA5 averages, 2021–2023. Crowd levels are our estimate.
Season by season
Spring (Mar–May)
About 15°C in March, 18°C in April and 22°C in May, with little rain by May; good for walking Ermoupoli and Ano Syros.
Summer (Jun–Aug)
About 26–29°C with almost no rain; warm sea, the meltemi wind in July and August and the Festival Aegean at the Apollo Theatre.
Autumn (Sep–Nov)
September (about 26°C) is warm and calm; October (about 22°C) is quiet and still dry; November (about 20°C) is cooler and wetter.
Winter (Dec–Feb)
Cool, about 14–17°C, with rain on 7–12 days a month; Ermoupoli stays open, but beach hotels close.
Events worth planning around
- Greek Orthodox Easter (March, April or May)
- Festival Aegean, with opera at the Apollo Theatre (usually July; check the programme)
- Feast of the Assumption (15 August)
When to avoid
Avoid mid-August if you dislike crowds and high prices; in winter, expect beach villages to be closed and boat trips not to run.
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Common questions
What is the best time to visit Syros?
June and September.
Is Syros open in winter?
Yes; Ermoupoli is a year-round town, though beach hotels close.
When is the Festival Aegean?
Usually in July, at the Apollo Theatre; check the current programme.