Weather in Therasia in September
Expect warm, almost completely dry weather in Therasia in September, late summer. Average highs reach 26°C / 79°F, with lows of around 21°C / 70°F. Expect just 1 rainy day in a typical September. Sea temperatures average around 24°C / 75°F, properly warm for swimming. Therasia is Santorini's quiet sister, sitting on the western edge of the same volcanic caldera. The first autumn storms can arrive, usually as short, sharp showers between long spells of sunshine. Daylight lasts about 12½ hours. 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 weather can change from one week to the next, so pack for both warm and cool days. The light is softer than in summer, which makes it a lovely time for photos and walks. It's comfortable to be out all day, though the midday sun is still strong.
Swimming in Therasia in September
September is a great month for swimming in Therasia, with water temperatures around 24°C / 75°F. After the warmest water of August, the sea cools only slowly. When the meltemi blows, north-facing beaches get rough, so head for sheltered bays on the south side. The sea is usually at its calmest early in the morning. Beach bars and sunbeds are open, with more space than in July and August.
Crowds & Prices in Therasia in September
September is a shoulder month in Therasia, busy enough to feel lively but well below the summer peak. You'll find better deals on rooms and car hire than in July and August. Staying slightly outside the main town usually means better value and more space. Weekdays are calmer than weekends at the most popular spots. You can often book at short notice, except around holidays.
What's Open in Therasia in September
In September, ferries from Santorini to Therasia run often, with extra fast boats in the peak season. Everything is open, from hotels and tavernas to beach bars and boat trips. Boat trips and excursions run regularly, weather permitting. Shops in tourist areas often stay open into the evening. Opening hours are long, with many tavernas serving until late. Plan ahead for public holidays, when many businesses close.
Festivals & Holidays in Therasia in September
Late-summer village festivals continue into September, and the grape harvest gets underway. September is harvest time, with grapes picked for wine in many areas and village feasts on 8 September for the Nativity of the Virgin. Locals in Therasia mark these dates in the traditional way, and visitors are welcome to join in. As the season quietens, local life takes over again, with markets and harvest gatherings.
Is September a Good Time to Visit Therasia?
September is one of the best months to visit Therasia. Expect highs of around 26°C / 79°F and lows near 21°C / 70°F. 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 Therasia in September?
Sunset in Therasia is at around 7:50 pm at the start of September, around 7:30 pm in mid-September and around 7:05 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 Therasia 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 take a day trip to Therasia in September?
Yes. Local boats from Santorini and many caldera boat tours stop at Therasia in September. It's a glimpse of how Santorini looked before mass tourism.
Do I need a car on Therasia in September?
No. Therasia is small enough to explore on foot, and the distances between the harbor, village and beaches are short. In September, some beaches may also be served by small boats or a seasonal minibus, and it's worth bringing a hat for the walks.
Is September or October better for visiting Therasia?
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.
Therasia Weather by Month
