The average temperature for the week of 25 August 2025 - 31 August 2025 was 30 °C (86 °F) during the day and 23 °C (73 °F) during the night. Both the daily and night temperatures in Kefalonia Island are roughly same as the long-term average, which is around 30 °C (86 °F) and 19 °C (66 °F) respectively. The average temperatures during different times of day (local time) were following: 7am 23 °C (73 °F), 10am 27 °C (81 °F), 1pm 28 °C (82 °F), 4pm 29 °C (84 °F), 7pm 29 °C (84 °F), 10pm 25 °C (77 °F).

During this week: 6 days without rain and 1 day with light rain were observed. The total precipitation for the week in Kefalonia Island was 1 mm (0.04 in), which is slightly below the area's average of 5 mm (0.20 in). The average cloud coverage during the daytime (from dawn to dusk) was 16 %.

The wind's speed averaged 3.4 m/s. The prevailing winds blew from the North-West. The atmosferic pressure ranged from 1012 hpa to 1016 hpa. The air in Kefalonia Island had an average humidity of 55 %.

On average, there were 11 hours clear skies, 1 hour partially overcast skies and 1.5 hours overcast skies during the daytime (from dawn to dusk). At 07:03, on average, the sun rose, and at 20:14, the sun set.

Weather overview

Kefalonia, a picturesque island located in Greece, is known for its warm Mediterranean climate. The island experiences a wide range of temperature fluctuations throughout the year, such as daytime temperatures varying from 13 °C (55 °F) in the colder month of January to a peak of 31 °C (88 °F) during the sweltering heat of August. While the sea temperatures reach their zenith in August at 25 °C (78 °F), the mercury dips to its nadir in February with a cool 15 °C (59 °F). Nighttime temperatures also see a significant transition from as low as 6 °C (42 °F) in February to a comfortable 20 °C (69 °F) in August. The island sees its driest period in July, with barely 1 day of rainfall; conversely, December is characterized by the most precipitation, with a substantial 12 days of rain.

January weather

In January, Kefalonia witnesses a decline in daytime temperatures, reaching a low of 13 °C (55 °F), while the sea temperature also begins its downward trend, registering at 16 °C (60 °F). The frequency of rainy days starts to decrease, alongside a noticeable dip in rainfall volume, recorded at 110 mm (4.32 in). There is an upswing in the number of clear-sky sunny hours, amounting to 5 hours, and the night temperature steadily decreases to 6 °C (43 °F).

February weather

February marks the period when Kefalonia experiences the lowest sea temperatures, at 15 °C (59 °F), and the nighttime temperature also reaches its minimum at 6 °C (42 °F). A decline in the amount of rainfall can be observed, setting at 97 mm (3.80 in). The duration of sunny hours sees an incremental increase, totaling 5 hours, while the month also witnesses the peak wind speed.

March weather

The number of rainy days in Kefalonia starts to decline in March, quantified at 9 days. Concurrently, we notice a decrease in rainfall volume to 73 mm (2.88 in). The temperatures during the day begin their ascension phase, documented at 15 °C (60 °F), and the nighttime temperatures follow suit, increasing to 8 °C (46 °F). The uplift in sunny hours continues, now registering 6 hours.

April weather

April in Kefalonia is characterized by a discernible rise in daytime temperatures, up to 19 °C (66 °F), and the commencement of an increase in sea temperatures, noted at 16 °C (61 °F). The downward trend of rainy days persists, documented at 6 days, and the rainfall volume further decreases to 51 mm (2.02 in). The enhancement of nighttime temperatures to 10 °C (50 °F) and the continued rise in sunny hours are also observed.

May weather

May greets Kefalonia with daytime temperatures comparable to the previous month, marked at 24 °C (75 °F), and the progression of sea temperature warming, now at 19 °C (66 °F). The reduction in the number of rainy days is notable, logged at 4 days, alongside a continued decline in rainfall, reaching 24 mm (0.93 in). The night periods show a consistent temperature rise, now at 14 °C (57 °F), and the onset of the dry season is felt.

June weather

June's weather pattern reflects a steady increase in the daytime temperature, which stands at 28 °C (82 °F), while the sea temperature further ascends to 22 °C (72 °F). The month marks the commencement of the tourist season with reduced rainfall, both in terms of days (2 days) and volume (13 mm (0.51 in)), and a rise in nighttime temperatures.

July weather

The peak of the tourist season in July aligns with the continued elevation of daytime temperatures to 31 °C (88 °F), and the sea temperature reaching further heights at 24 °C (75 °F). The absolute minimum in the number of rainy days is noted, evidenced at 1 day, and the zenith of sunny hours is achieved along with the peak in clear, cloudless skies.

August weather

August in Kefalonia marks the climax of both the tourist and dry seasons. The sea temperature hits an annual high, alongside the daytime temperature reaching its maximum of 31 °C (88 °F). Furthermore, the month features the warmest nights at 20 °C (69 °F). The sunny hours slightly recede from their maximum in the preceding month.

September weather

The shift towards cooler days in September is palpable, with daytime temperatures starting to decrease to 27 °C (81 °F). The sea temperature also begins its decline, noted at 24 °C (76 °F). An upward trend in the number of rainy days is detected, alongside the initial rise in rainfall volume to 51 mm (1.99 in), marking the end of dry season patterns. The night temperature starts to reduce, settling at 18 °C (64 °F).

October weather

October observes a continuation in the descent of sea temperatures to 22 °C (72 °F) and a similar trend in daytime temperatures. The frequency of rainy days increases, quantified at 7 days, and so does the rainfall volume. The downward trajectory of the nighttime temperature also continues. The decrease in sunny hours becomes more evident, logging 7 hours.

November weather

November sees a further drop in daytime temperatures to 17 °C (63 °F), paralleled by the sea temperatures also on the decline, marked at 20 °C (68 °F). The increasing number of rainy days coincides with the peak rainfall of the year, signaling the wettest period in Kefalonia. The night temperature decrement persists, and the dwindling solar hours reach a notable point.

December weather

December's drop in daytime temperatures is noticeable in Kefalonia, as is the diminishing of sea temperatures. The peak in the number of rainy days, reaching 12 days, denotes the highest level of precipitation. The decline in nighttime temperatures continues, registering at 8 °C (46 °F). The shortest sunny hours and day lengths are recorded during this month.

How many hours of sunlight can be typically enjoyed during January?

January in Kefalonia brings about an average of 5 hours of sunshine, letting you bask in the sun for a reasonable part of the day.

Is February quite windy in Kefalonia?

Yes, wind speeds tend to reach their highest in February, creating the breeziest conditions of the year.

Does the daytime temperature in March signify the onset of warmer weather?

Indeed, with the daytime temperature ascending to 15 °C (60 °F), March indicates the beginning of warmer days ahead.

What might one expect regarding the nighttime temperatures in April?

As April unfolds, the nighttime temperatures in Kefalonia improve to a mild 10 °C (50 °F).

What's the likelihood of experiencing rain in May?

May is typically a dry month in Kefalonia, with a low probability of rain over approximately 4 days.

Will I need an umbrella during my June holiday in Kefalonia?

Carrying an umbrella for June in Kefalonia is largely unnecessary, as rain is infrequent and limited to a mere 2 days.

Is the sea temperature in July conducive to swimming?

July's inviting sea temperature of 24 °C (75 °F) provides perfect conditions for swimming and enjoying water activities.

How does the warmest month of the year, August, affect nighttime activities?

August's balmy evenings with temperatures around 20 °C (69 °F) offer a comfortable setting for nighttime events and socializing outdoors.

Does September signal the return of the rain in Kefalonia?

September in Kefalonia introduces a gradual resurgence of rain, although it still remains largely dry with only 4 days expected to be wet.

What are the chances of encountering rain in October?

Rain becomes more typical in October, with an anticipated 7 days of precipitation.

How do nighttime temperatures in November affect evening outings?

Evening outings in November come with cooler conditions, as temperatures tend to fall to about 11 °C (52 °F), suggesting a need for warmer attire.

Are the shorter days and decreased sunlight significant in December?

Yes, December is marked by the shortest days and minimal sunlight, reflecting the winter season's influence.