Weather in Kefalonia in September
September in Kefalonia means late-summer conditions: warm and fairly changeable. Average highs reach 27°C / 80°F, with lows of around 19°C / 66°F. In the water, expect around 25°C / 77°F, properly warm for swimming. There are typically 4 rainy days, with around 54 mm of rain in total. Kefalonia is the largest Ionian island, dominated by Mount Ainos, which can see snow in winter. Heavy showers and thunderstorms can arrive in autumn, usually between long, warm, sunny spells. Daylight lasts about 12½ hours. Pack summer clothes, a light layer for the evenings and good sun protection. 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. Mornings and evenings get noticeably cooler as the month goes on. It's comfortable to be out all day, though the midday sun is still strong.
Swimming in Kefalonia in September
Swimming is excellent in Kefalonia in September, with the sea averaging around 25°C / 77°F. The sea holds on to the summer's warmth after peaking in August. Try Myrtos and Antisamos for clear water. Beaches are lively but less crowded than in high summer. Smaller beaches often have no shade, so bring your own. Quieter coves around the coast are often just as beautiful as the famous beaches. No wetsuit needed.
Crowds & Prices in Kefalonia in September
September is a shoulder month in Kefalonia, 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. Cruise ships call regularly, so the busiest spots can be crowded in the middle of the day. The busiest spot is Myrtos and Melissani Cave; for more space, go early in the morning or explore the quieter south. Booking a few weeks ahead is usually enough.
What's Open in Kefalonia in September
In September, ferries from Kyllini to Kefalonia 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. Everything is open, from hotels and tavernas to beach bars and boat trips. Archaeological sites and museums are on their longer summer hours. Melissani Cave is open on its full summer schedule.
Festivals & Holidays in Kefalonia 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 Kefalonia 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 Kefalonia?
September is one of the best months to visit Kefalonia. Expect highs of around 27°C / 80°F, lows near 19°C / 66°F and rain on around 4 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 Kefalonia in September?
In early September, the sun sets in Kefalonia at around 8:10 pm. By mid-month it's around 7:50 pm, and by the end of September around 7:25 pm. All times are Greek local time. Evenings cool quickly after sunset, so bring a layer.
Is it still hot in Kefalonia in September?
Yes, especially in the first half of the month. September stays warm and sunny, and the sea is still warm from the summer, but the heat is gentler and nights are more comfortable. Thunderstorms become more likely towards the end of the month, as autumn reaches the west earlier than the Aegean.
Can I visit Melissani Cave in September?
Yes. Melissani Cave is open in September, and it's a welcome break from the heat, but it's busy, so go early to avoid the queues. Its underground lake is explored by rowing boat and is at its most magical when sunlight pours through the open roof around midday.
Do I need a car on Kefalonia in September?
It's the best way to explore. Kefalonia is spread out, and buses mainly link Argostoli with the busiest beaches and villages, so a hire car lets you reach quieter corners. In September, book early, as rental cars can sell out.
Is September or October better for visiting Kefalonia?
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.
Kefalonia Weather by Month
