Weather in Kefalonia - 14-day forecast

Detailed weather forecast for Kefalonia, Greece: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Kefalonia

today☀️ 30°night 23°

Sun☀️ 31°💧 0.4 mm

Mon☀️ 30°night 25°

Tue☀️ 28°💧 0.5 mm

Wed☀️ 27°night 24°

Thu🌧️ 26°💧 0.4 mm

Fri🌧️ 26°💧 2.1 mm

Sat🌧️ 25°💧 0.2 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in Kefalonia, the forecast high is 31°C. Typical daytime temperatures at this time of year range from 25°C to 29°C, so it will be exceptionally warm. It is warmer than 97% of similar days.

Saturday 5 Sept

30°Cexceptionally warm

usually 25°C–29°C

warmer than 95% of similar days

night: near normal rain: less rain than usual wind: lighter than usual

Sunday 6 Sept

31°Cexceptionally warm

usually 25°C–29°C

warmer than 97% of similar days

night: near normal rain: typical rainfall wind: typical

Monday 7 Sept

30°Cexceptionally warm

usually 25°C–28°C

warmer than 94% of similar days

night: near normal rain: less rain than usual wind: exceptionally light

Tuesday 8 Sept

28°Cwarmer than usual

usually 25°C–28°C

warmer than 72% of similar days

night: near normal rain: typical rainfall wind: lighter than usual

Wednesday 9 Sept

27°Cnear normal

usually 25°C–28°C

night: near normal rain: less rain than usual wind: lighter than usual

Thursday 10 Sept

26°Cnear normal

usually 25°C–28°C

night: near normal rain: typical rainfall wind: exceptionally light

Friday 11 Sept

26°Cnear normal

usually 25°C–28°C

night: near normal rain: more rain than usual wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 26°C by day. The coolest year was 1996 (23°C) and the warmest was 2008 (30°C). The current forecast averages 28°C - higher than in 82% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

Weather warnings - Kefalonia

No active weather warnings for Kefalonia (region: IONION ISLANDS). The national weather service is not forecasting dangerous conditions.

14-day forecast - Kefalonia

Kefalonia - 14-day weather forecast infographic

Kefalonia 30 & 45-day weather - long-range outlook

Next 16 days · forecast

26°

around 23° at night · days with rain: 5

Weeks 3-4 · avg for September

28°

around 20° at night · rain chance 24%

Weeks 5-7 · avg for October

24°

around 17° at night · rain chance 38%

The 30 & 45-day outlook for Kefalonia: the next 16 days are a numerical forecast updated daily - on average 26° by day and 23° at night. Further out we rely on multi-year climate averages: around 28° in September, and about 24° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Kefalonia

Saturday5 September 2026

☀️30°clear sky

sunrise 07:10 · sunset 20:02 · night 23° · evening 29° · humidity 49% · wind 4 m/s · clouds 3%

Sunday6 September 2026

☀️31°clear sky

sunrise 07:11 · sunset 20:01 · night 24° · evening 28° · rain 0.39 mm · humidity 48% · wind 5 m/s · clouds 2%

Monday7 September 2026

☀️30°clear sky

sunrise 07:12 · sunset 19:59 · night 25° · evening 27° · humidity 44% · wind 3 m/s · clouds 4%

Tuesday8 September 2026

☀️28°clear sky

sunrise 07:13 · sunset 19:57 · night 24° · evening 27° · rain 0.51 mm · humidity 54% · wind 4 m/s · clouds 100%

Wednesday9 September 2026

☀️27°clear sky

sunrise 07:14 · sunset 19:56 · night 24° · evening 26° · humidity 54% · wind 4 m/s · clouds 70%

Thursday10 September 2026

🌧️26°light rain

sunrise 07:15 · sunset 19:54 · night 24° · evening 26° · rain 0.36 mm · humidity 58% · wind 4 m/s · clouds 1%

Friday11 September 2026

🌧️26°light rain

sunrise 07:15 · sunset 19:53 · night 23° · evening 25° · rain 2.1 mm · humidity 64% · wind 3 m/s · clouds 24%

Saturday12 September 2026

🌧️25°light rain

sunrise 07:16 · sunset 19:51 · night 24° · evening 25° · rain 0.24 mm · humidity 61% · wind 4 m/s · clouds 54%

Sunday13 September 2026

🌤️25°a few clouds

sunrise 07:17 · sunset 19:50 · night 23° · evening 24° · rain 1.47 mm · humidity 58% · wind 4 m/s · clouds 21%

Monday14 September 2026

🌧️24°light rain

sunrise 07:18 · sunset 19:48 · night 23° · evening 24° · rain 0.3 mm · humidity 66% · wind 4 m/s · clouds 18%

Tuesday15 September 2026

☀️25°clear sky

sunrise 07:19 · sunset 19:47 · night 22° · evening 24° · humidity 53% · wind 3 m/s · clouds 2%

Wednesday16 September 2026

🌧️23°light rain

sunrise 07:20 · sunset 19:45 · night 23° · evening 24° · rain 2.1 mm · humidity 76% · wind 6 m/s · clouds 86%

Thursday17 September 2026

🌧️24°light rain

sunrise 07:21 · sunset 19:43 · night 22° · evening 23° · rain 1.26 mm · humidity 54% · wind 5 m/s · clouds 11%

Friday18 September 2026

🌧️23°light rain

sunrise 07:21 · sunset 19:42 · night 22° · evening 24° · rain 0.87 mm · humidity 63% · wind 3 m/s · clouds 3%

Saturday19 September 2026

🌧️23°light rain

sunrise 07:22 · sunset 19:40 · night 21° · evening 22° · rain 1.62 mm · humidity 62% · wind 5 m/s · clouds 1%

Sunday20 September 2026

🌧️21°light rain

sunrise 07:23 · sunset 19:39 · night 22° · evening 22° · rain 0.36 mm · humidity 62% · wind 10 m/s · clouds 40%

UV index in Kefalonia - is it safe to sunbathe?

Today the UV index in Kefalonia is 7 (high) - unprotected fair skin can burn in about 30 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.

Pollen in Kefalonia - info for allergy sufferers

Today ragweed pollen is highest in Kefalonia - about 7 grains/m³, low level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.

Sea temperature - Kefalonia

Water today

30°C

Week avg

29°C

Waves today

0.2 m

How's the water?

very warm

16-day sea temperature forecast:

5.09 30°C6.09 29°C7.09 29°C8.09 29°C9.09 29°C10.09 29°C11.09 29°C12.09 29°C13.09 28°C

Average sea temperature through the year:

Jan 17°CFeb 17°CMar 17°CApr 17°CMay 20°CJun 24°CJul 27°CAug 27°CSep 26°COct 23°CNov 22°CDec 19°C

Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Kefalonia weather through the year

Upcoming public holidays in Greece: Ochi Day — 28 October · Christmas Day — 25 December · St. Stephen's Day — 26 December.

Nearby and related places

GjirokasterLesbosCreteRhodesAthensSamosAndros

FAQ - Kefalonia weather

What is the weather like in Kefalonia today?

Today it is about 30° during the day and 23° at night, clear sky.

How far ahead can I check the forecast for Kefalonia?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.