September · Greece
Best time to visit Sifnos in September Weather, crowds & prices
Weather in Sifnos in September
Average temperature 25°C, 15 mm of rain, about 25 days with 6+ hours of sunshine and 71% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.9/10
Ranked #2 of 12 months
- Avg temp
- 25°C
- Rainfall
- 15 mm
- Humidity
- 71%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Sifnos scores 9.9/10 for beach and coastal travel - one of the top 12-month picks (#2). Expect around 25°C, 15 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Sifnos is the Cycladic island of potters and chefs, with white villages, old trails and the Chrysopigi monastery.
September in Sifnos — one of the year's strongest windows (2nd)
September averages 25°C (77°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 15 mm of rain — occasional showers rather than washed-out days — alongside about 25 days with 6+ hours of sunshine and 12.2 daylight hours.
A 9.9/10 puts this among the year's best months in Sifnos (2nd of 12); only July scores higher, at 9.9/10.
Pack light clothing, swimwear and real sun protection.
Plan for peak pricing, with 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 Sifnos in September?
- In September, Sifnos averages 25°C, 15 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 9.9/10.
- Is September a good time to visit Sifnos?
- September earns a 9.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Sifnos in September?
- Expect about 15 mm of rain in September. Average humidity is 71% and there are about 25 days with 6+ hours of sunshine.
Curated in Sifnos
Tickets & experiences
Things to do in Sifnos
Sifnos, Greece. Live activities and tours from GetYourGuide, matched to this destination.