Kefalonia Weather in September 2026: what to expect (8.5/10)

The month in detail

What to expect in September

Autumn in Kefalonia is often underrated: 27.0°C, golden light and declining crowds. An interesting window. Rain risk remains low (21.0% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if June (9.1/10) remains theoretically better.

September ranks 2 out of 12 months in Kefalonia. Compared to August: −3°C daytime, 13 pts more rainy days, −1.6h of sun per day.

This month's conditions

What it's like in September

UV index

6 · high

sunscreen and hat advised

Feels like

muggy at times

19°

Sea

25°C

pleasant for swimming

Daylight

12.2h of daylight

Air quality

good

AQI 34

Compare

Is September the right month?

The best month in Kefalonia is June (9.1/10), 0.6 pt higher than September.

See June →See all 12 months →

Context

Our verdict

Kefalonia (Cephalonia), the largest Greek Ionian island: 35,000 inhabitants over 780 km² south of Corfu. Made famous by the Louis de Bernières novel Captain Corelli's Mandolin (1994) then the 2001 film with Nicolas Cage.

Read Gilles' full review →

Book

Plan your trip

Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.

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Stay

Hotels & rentals · Kefalonia

Expedia →

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Activities

Tours, tickets, experiences

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Flights

Multi-airline comparator

Kiwi →

🎟️ Activities & tours · Kefalonia

GetYourGuide selection · free cancellation

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Affiliate link · GetYourGuide

Practical info

What you need to know before you go

Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.

Country · Greece

🗣️LanguageGreek

💶CurrencyEuro (€)

🚗DrivingRight-hand

🛡️Safety ⓘVery safe · 1/5

💰Cost of living ⓘModerate · 3/5

🌡️ Climate

🌍Climate typeTemperate oceanic

📈Climate trendData unavailable

🔥Hottest monthJuly · 30°C

❄️Coolest monthJanuary · 14°C

🌧️Rainiest month ⓘJanuary · 48%

🏖️ Beach holiday

📅Peak seasonJuin → Sept

🏖️Swell (Sept–Mar) ⓘModérée

🛂VisaSchengen · 90 days

Explore

Other destinations in September

If September doesn't convince you for this destination, compare with others.

Similar climate

Nearby

PeloponneseGreece181 km

Other top picks

🗺️ See all 754 destinations on the map

Location

Where is Kefalonia ?

Global position + regional geographic context.

🌍 World

🔍 Geographic context

Greece

Temperate oceanic climate with a 9.1 → 4.1 gap between best and worst month. 10 years of ERA5 data to choose by project.

38.18°N · 20.49°E

Questions

Frequently asked questions

What is the best time to visit Kefalonia?

June is the best month with 27.0°C highs, 21.0°C lows, 9.3h of sunshine and 11.0% rainy days. The months of June & September offer comparable conditions.

How many hours of sunshine does Kefalonia get in June?

Kefalonia averages 9.3 sunshine hours per day in June. It is the sunniest month with a climate score of 8.8/10.

What is the rainiest month in Kefalonia?

January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.

What are the temperatures at night in Kefalonia in June?

In June, overnight lows reach 21.0°C, while afternoon highs average 27.0°C.

Is Kefalonia good in winter?

In winter (December-February), Kefalonia scores 4.1/10 on average — Difficult period — prefer the peak season.. The best month overall remains June with a score of 8.8/10.

When should you avoid Kefalonia?

January is the most difficult month to visit Kefalonia, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.

Can you swim in Kefalonia in September?

In September, the sea averages 25°C in Kefalonia: pleasant for swimming. Swimming is pleasant without a wetsuit.

Do you need sun protection in Kefalonia in September?

The average UV index reaches 6 in September in Kefalonia (high), with about 12.2h of daylight. Sunscreen and hat advised.