May · Greece
Best time to visit Syros in May Weather, crowds & prices
Weather in Syros in May
Average temperature 19°C, 22 mm of rain, about 31 days with 6+ hours of sunshine and 77% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
9.6/10
Ranked #2 of 12 months
- Avg temp
- 19°C
- Rainfall
- 22 mm
- Humidity
- 77%
- Days with 6h+ sun
- 31
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
May in Syros scores 9.6/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 19°C, 22 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Syros is a Cycladic island whose capital, Ermoupoli, is a marble-built neoclassical port city of arcades.
May is one of the strongest months in Syros (2nd)
Temperatures hover around 19°C (66°F) — the kind of month where neither heat nor cold forces the schedule.
With around 22 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 14 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Syros at 9.6/10 (2nd of 12), just behind April at 9.6/10.
Pack layers you can shed by midday plus one warm layer for the evening.
Budget for peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Syros in May?
- In May, Syros averages 19°C, 22 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.6/10.
- Is May a good time to visit Syros?
- May earns a 9.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Syros in May?
- Expect about 22 mm of rain in May. Average humidity is 77% and there are about 31 days with 6+ hours of sunshine.
Curated in Syros
Tickets & experiences
Things to do in Syros
Syros, Greece. Live activities and tours from GetYourGuide, matched to this destination.