Weather in Kos in September
September is late summer in Kos: hot and almost completely dry. Temperatures typically peak at around 28°C / 82°F in the afternoon and fall to about 23°C / 73°F at night. Even after dark it stays warm, so a room with air-conditioning makes a difference. You're very unlikely to see any rain. In the water, expect around 25°C / 77°F, warm enough for long swims. The first autumn storms can arrive, usually as short, sharp showers between long spells of sunshine. Kos is long and fairly flat, with sandy beaches along its coasts and a mountain ridge running along the south of the island. Daylight lasts about 12½ hours. Pack light, breathable clothes, a sun hat, high-factor sunscreen and sunglasses. When the wind picks up, a light windproof layer is handy for evenings by the water. Plan sightseeing for the early morning or evening, and keep the midday hours for the beach or a shaded taverna.
Swimming in Kos in September
The sea in Kos averages around 25°C / 76°F in September, warm enough to stay in for as long as you like. The sea holds on to the summer's warmth after peaking in August. Paradise Beach and Tigaki are local favorites. The summer wind can churn up exposed beaches, so check which way it's blowing before you pick one. Beach bars and sunbeds are open, with more space than in July and August. No wetsuit needed.
Crowds & Prices in Kos in September
September is a shoulder month in Kos, busy enough to feel lively but well below the summer peak. Prices are noticeably lower than in high summer, and there's more choice of rooms. Early mornings and late afternoons are the quietest times at popular sights. Weekdays are calmer than weekends at the most popular spots. You can often book at short notice, except around holidays.
What's Open in Kos in September
In September, ferries from Piraeus to Kos run often, with extra fast boats in the peak season. The airport has direct flights from across Europe in the season, as well as flights from Athens. It's the full season, so hotels, restaurants, beach bars and excursions are all running. Museums and sites are open on extended summer hours. Shops in tourist areas often stay open into the evening.
Festivals & Holidays in Kos 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. In Kos, as across Greece, these traditions are very much alive. As the season quietens, local life takes over again, with markets and harvest gatherings.
Is September a Good Time to Visit Kos?
September is one of the best months to visit Kos. Expect highs of around 28°C / 82°F, lows near 23°C / 73°F and almost no rain. 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 Kos in September?
Sunset in Kos is at around 7:40 pm at the start of September, around 7:20 pm in mid-September and around 6:55 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 Kos 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 Kos Town in September?
Yes. Kos Town is at its liveliest in September, but also at its busiest. Explore in the morning or after sunset, when it's cooler and the atmosphere is at its best. The ancient agora and the Castle of the Knights sit right in the center.
Do I need a car on Kos in September?
Not necessarily. Buses link Kos Town 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 Kos?
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.
Kos Weather by Month
