Weather in Alonissos in September
Expect warm, mostly dry weather in Alonissos in September, late summer. Average highs reach 25°C / 77°F, with lows of around 19°C / 66°F. The sea averages about 24°C / 75°F, properly warm for swimming. Expect just 2 rainy days in a typical September. The first autumn storms can arrive, usually as short, sharp showers between long spells of sunshine. Alonissos is covered in pine forest that runs down to quiet coves, and it sits within a national marine park. You get about 12½ hours of daylight a day. Summer clothes are fine by day, with a light layer for the evenings and plenty of sunscreen. When the wind picks up, a light windproof layer is handy for evenings by the water. The light is softer than in summer, which makes it a lovely time for photos and walks. It's pleasant to be outside from morning to evening, with sun protection at midday.
Swimming in Alonissos in September
The sea in Alonissos averages around 24°C / 76°F in September, warm enough to stay in for as long as you like. Swimming is still good, although the sea has cooled since August. Good spots include Agios Dimitrios and Milia. On windy days, choose a beach sheltered from the north, where the water stays calmer. Beaches are lively but less crowded than in high summer. You won't need a wetsuit.
Crowds & Prices in Alonissos in September
In Alonissos, September strikes a good balance between atmosphere and space. Hotel rates sit between the winter lows and the summer peak. Weekdays are calmer than weekends at the most popular spots. Early mornings and late afternoons are the quietest times at popular sights. Staying slightly outside the main town usually means better value and more space. A few weeks' notice is usually enough to find a good room.
What's Open in Alonissos in September
Ferries to Alonissos from Volos and Agios Konstantinos run at full summer frequency in September, but they sell out, so book ahead. It's the full season, so hotels, restaurants, beach bars and excursions are all running. Archaeological sites and museums are on their longer summer hours. Shops in tourist areas often stay open into the evening. Opening hours are long, with many tavernas serving until late.
Festivals & Holidays in Alonissos in September
September is harvest time, with grapes picked for wine in many areas and village feasts on 8 September for the Nativity of the Virgin. Late-summer village festivals continue into September, and the grape harvest gets underway. Locals in Alonissos mark these dates in the traditional way, and visitors are welcome to join in. It's a good time to see traditions that have nothing to do with tourism, from harvests to name days.
Is September a Good Time to Visit Alonissos?
September is one of the best months to visit Alonissos. Expect highs of around 25°C / 77°F, lows near 19°C / 66°F and rain on around 2 days. The sea is warm, the weather is reliable and the summer crowds are thinner, so beaches and villages feel relaxed. It suits almost everyone, from couples to families outside school holidays. The only caveat is that a few seasonal businesses may be closed at the very start or end of the season.
Frequently Asked Questions
What time does the sun set in Alonissos in September?
Sunset in Alonissos is at around 7:55 pm at the start of September, around 7:35 pm in mid-September and around 7:10 pm by the end of the month, in Greek local time. Evenings cool quickly after sunset, so bring a layer.
Is it still hot in Alonissos in September?
Yes, especially in the first half of the month. September usually stays warm and sunny, and the sea is still warm from the summer. The meltemi tends to ease, nights become more comfortable, and the first autumn showers sometimes arrive late in the month, although rain is still uncommon.
Can I visit the National Marine Park of Alonissos in September?
Yes. Boat trips to the National Marine Park of Alonissos run regularly in September, but they're busy, so book ahead or take the first departure of the day. Trips can still be cancelled on very windy days. Boat trips from Patitiri explore the park's islets, and you may spot dolphins.
Do I need a car on Alonissos in September?
Not necessarily. Buses link Patitiri with the main beaches and villages in September, and taxis are available, though they're busy. A car, scooter or ATV gives you more freedom to explore quieter corners, so book one early.
Is September or October better for visiting Alonissos?
September, if you want swimming and everything open. October is quieter and cheaper, and the sea often stays pleasant early in the month, but the weather becomes more changeable and many seasonal hotels, tavernas and boat trips wind down as the month goes on.
Alonissos Weather by Month
