September · Greece
Best time to visit Syros in September Weather, crowds & prices
Weather in Syros in September
Average temperature 25°C, 16 mm of rain, about 23 days with 6+ hours of sunshine and 71% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.6/10
Ranked #5 of 12 months
- Avg temp
- 25°C
- Rainfall
- 16 mm
- Humidity
- 71%
- Days with 6h+ sun
- 23
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Syros scores 8.6/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 25°C, 16 mm of rain, and roughly 23 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.
September in Syros — one of the year's strongest windows (5th)
At 25°C (76°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
With around 16 mm of rain, any showers tend to pass through rather than settle in; about 23 days with 6+ hours of sunshine and 12.2 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Syros at 8.6/10 (5th of 12), just behind April at 9.6/10.
Pack light clothing, a hat and real sun protection.
Expect mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Syros in September?
- In September, Syros averages 25°C, 16 mm of rain, and about 23 days with 6+ hours of sunshine. Its climate-comfort score is 8.6/10.
- Is September a good time to visit Syros?
- September earns a 8.6/10 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 September?
- Expect about 16 mm of rain in September. Average humidity is 71% and there are about 23 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.