SeasonMapKefalonia weather in September
Greece
September in Kefalonia: hot, a little rain — an excellent time to visit.
#4 of 12 months in Kefalonia · #374 of 1383 destinations to visit in September · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kefalonia in September
Other months in Kefalonia
Kefalonia's forum puts August around 30°C in the shade with roughly 12 hours of sunshine a day, capable of hitting 40°C on the hottest days especially early in the month. Regulars describe the classic siesta rhythm — sightseeing before 11:30am, shade and a long lunch through the peak heat, back out around 4pm — and note the Greek heat feels notably less oppressive than a 30°C day in a humid climate.
Add your own note from Kefalonia's card on the map.
Kefalonia climate normals — September
| Daytime high | 29°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 32°C / 90°F | |
| Sea temperature | 25°C / 77°F | 😎 warm sea |
| Rainfall | 64 mm / 2.5 in | 🌦 some rain |
| Rainy days | 5 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12.4 h | |
| Wind | 25 km/h / 16 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Kefalonia in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer holidays in Greece, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Kefalonia's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherKefalonia's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Kefalonia in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Loggerhead turtles
1 May – 15 Sep · usuallyTurtle nestingLoggerheads nest on the south-coast beaches around Katelios through the summer, and adults hang around the fishing boats in Argostoli harbour waiting for scraps.
- Season
Sea warm enough to swim
1 Jun – 15 Oct · usuallyThe Ionian is calmer and clearer than the Aegean because the meltemi does not reach here. Myrtos is the postcard; the small coves on the Paliki side are the swim.
- Hazard
Wildfire season
15 Jun – 30 SepSmoke seasonThe fir forest on Mount Ainos and the scrub above the coast road carry real risk in a dry summer, and the national park closes to visitors on high-risk days. Source ↗
- Nature
Robola harvest
20 Aug – 30 Sep · usuallyThe vines grow on limestone rubble on the slopes below Ainos and are picked from late August. The cooperative at Omala opens for tasting through the harvest.
Nearby, and something's on
Within 300 km of Kefalonia — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Kefalonia?
Kefalonia in September — FAQ
- Is September a good time to visit Kefalonia?
- September in Kefalonia: hot, a little rain — an excellent time to visit. It ranks #4 of 12 months for Kefalonia on SeasonMap's comfort score (87/100).
- What is the weather like in Kefalonia in September?
- In September, Kefalonia averages a daily high of 28.6°C and a low of 20.6°C, with about 64.3 mm of rain over roughly 4.9 rainy days.
- What is the air quality in Kefalonia in September?
- Kefalonia has a mean US Air Quality Index of about 51 in September.
Other months in Kefalonia
Compare Kefalonia in September
Warmer or cooler than Kefalonia in September
Similar destinations in Southern Europe — September
Within 300 km: Zakynthos' Loggerhead nesting in Laganas Bay on 1 May – 31 Oct, and Corfu's Cricket on the Spianada around 1 May – 15 Sep.