September · Greece
Best time to visit Kythnos in September Weather, crowds & prices
Weather in Kythnos in September
Average temperature 25°C, 24 mm of rain, about 23 days with 6+ hours of sunshine and 69% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.9/10
Ranked #4 of 12 months
- Avg temp
- 25°C
- Rainfall
- 24 mm
- Humidity
- 69%
- Days with 6h+ sun
- 23
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Kythnos scores 9.9/10 for beach and coastal travel - an above-average month (#4 of 12). Expect around 25°C, 24 mm of rain, and roughly 23 days with 6+ hours of sunshine this month.
Kythnos keeps dry stone walls, a divided hilltop capital and the sandy sandbar at Kolona in the western Cyclades.
September ranks 4th of 12 for Kythnos — one of the best windows
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 24 mm of rain — occasional showers rather than washed-out days — alongside about 23 days with 6+ hours of sunshine and 12.2 daylight hours.
A 9.9/10 puts this among the year's best months in Kythnos (4th of 12); only June scores higher, at 9.9/10.
Pack light clothing, swimwear and real sun protection.
Plan for peak pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Kythnos in September?
- In September, Kythnos averages 25°C, 24 mm of rain, and about 23 days with 6+ hours of sunshine. Its climate-comfort score is 9.9/10.
- Is September a good time to visit Kythnos?
- 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 Kythnos in September?
- Expect about 24 mm of rain in September. Average humidity is 69% and there are about 23 days with 6+ hours of sunshine.
Curated in Kythnos
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Things to do in Kythnos
Kythnos, Greece. Live activities and tours from GetYourGuide, matched to this destination.