SeasonMapKefalonia weather in August
Greece
August in Kefalonia: sweltering, dry, with muggy air — fine if you can take 37°C afternoons.
#3 of 12 months in Kefalonia · #179 of 1383 destinations to visit in August · comfort 91/100 (tier S)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kefalonia in August
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 — August
| Daytime high | 32°C / 90°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 37°C / 99°F | |
| Sea temperature | 26°C / 79°F | 😎 warm sea |
| Rainfall | 7 mm / 0.3 in | ☀️ dry |
| Rainy days | 2 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 12.5 h/day | |
| Daylight | 13.6 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 62 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Kefalonia in August
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.
Peak crowdsAugust peak, Summer holidays in Greece, school holidays in 7 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).
Best weatherKefalonia's weather peaks June–August, best around July.
August includes Loggerhead turtles.
Best weatherFair weatherToughest weather
What's on in Kefalonia in August
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 ↗
- Holiday
August peak
1–31 AugSchool holidaysCrowdedBook earlyGreek holidays and the Dormition on 15 August fill the island at once, and the ferries from Kyllini and Patras are the choke point. Hire cars go before rooms do. Source ↗
- Festival
Snakes of the Virgin, Markopoulo
6–16 AugMajor festivalSmall harmless cat snakes turn up in the church at Markopoulo in the days before 15 August and are handled by the congregation. Villagers read a year with no snakes as a bad sign. 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 August — FAQ
- Is August a good time to visit Kefalonia?
- August in Kefalonia: sweltering, dry, with muggy air — fine if you can take 37°C afternoons. It ranks #3 of 12 months for Kefalonia on SeasonMap's comfort score (91/100).
- What is the weather like in Kefalonia in August?
- In August, Kefalonia averages a daily high of 32.1°C and a low of 23.3°C, with about 6.5 mm of rain over roughly 1.5 rainy days.
- What is the air quality in Kefalonia in August?
- Kefalonia has a mean US Air Quality Index of about 62 in August.
Other months in Kefalonia
Compare Kefalonia in August
Warmer or cooler than Kefalonia in August
Similar destinations in Southern Europe — August
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.