September · Greece
Best time to visit Alonnisos in September Weather, crowds & prices
Weather in Alonnisos in September
Average temperature 22°C, 86 mm of rain, about 28 days with 6+ hours of sunshine and 68% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.6/10
Ranked #4 of 12 months
- Avg temp
- 22°C
- Rainfall
- 86 mm
- Humidity
- 68%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Alonnisos scores 8.6/10 for beach and coastal travel - an above-average month (#4 of 12). Expect around 22°C, 86 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Alonnisos is a Sporades island with a hilltop old village, pine-covered coast and a marine park for monk seals.
September ranks 4th of 12 for Alonnisos — one of the best windows
September averages 22°C (72°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 86 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 12.4 hours of daylight.
A 8.6/10 puts this among the year's best months in Alonnisos (4th of 12); only June scores higher, at 10/10.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Alonnisos in September?
- In September, Alonnisos averages 22°C, 86 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 8.6/10.
- Is September a good time to visit Alonnisos?
- 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 Alonnisos in September?
- Expect about 86 mm of rain in September. Average humidity is 68% and there are about 28 days with 6+ hours of sunshine.
Curated in Alonnisos
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Alonnisos, Greece. Live activities and tours from GetYourGuide, matched to this destination.