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Greece

Kefalonia weather in September

Is it warm? Yes. September in Kefalonia is hot: afternoons average 28°C and nights 20°C. Most days (80%) peak between 26°C and 31°C.

Hot · average high

28°C

25°C or more on nine in ten days or more; 20°C or more on almost every day.

  • Average low20°overnight
  • Sea25°average, 2022–2025
  • Rainy days467 mm in the month
  • SkySome cloud26% cloud · 63% clear days

How warm it really gets

Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 26° and 31°.

Number of September days by daily high, 2011–2025.

September, year by year

The average September high in each year. The warmest, 2011, averaged 29°C; the coolest, 2016, 27°C.

Average September high by year: 2011: 29.4°C, 2012: 28.6°C, 2013: 28°C, 2014: 27.4°C, 2015: 28.7°C, 2016: 27.1°C, 2017: 27.6°C, 2018: 28.7°C, 2019: 29.2°C, 2020: 28.8°C, 2021: 28°C, 2022: 28.5°C, 2023: 28.2°C, 2024: 28.5°C, 2025: 28.6°C.

Compared with home

Average September highs. Expect rain on about 4 days (67 mm in a typical month).

  • Kefalonia28°
  • London21°
  • Manchester18°
  • Dublin18°
  • Cork18°
  • Belfast17°
  • Glasgow17°

Other months

Kefalonia all year · Where else is hot in September

Warmer in September, not much further

Flying times are estimates from Dublin; Kefalonia is about 3h 45m.

  • Hot in Sep

    32°C average high

    avg high · 19° at night

    25°C+ on almost every day

    Seville

    Spain

    Sea
    Inland
    Rain
    3 days
    Sky
    Some cloud
    From Dublin
    ≈ 2h 45m

  • Hot in Sep

    30°C average high

    avg high · 22° at night

    25°C+ on almost every day

    Hammamet

    Tunisia

    Sea
    27°
    Rain
    4 days
    Sky
    Some cloud
    From Dublin
    ≈ 3h 15m

  • Very hot in Sep

    33°C average high

    avg high · 19° at night

    25°C+ on almost every day · often 35°C+

    Marrakech

    Morocco

    Sea
    Inland
    Rain
    1 day
    Sky
    Some cloud
    From Dublin
    ≈ 3h 30m

Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Kefalonia airport. Sea: Copernicus ERA5, 2022–2025. Rainy days = days with 1 mm of rain or more, as weather stations count them. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology