Climate - Skiathos (Greece)

The climate of Skiathos, a Greek island belonging to the Northern Sporades, is Mediterranean, with relatively mild, rainy winters and hot, sunny summers.
The daily average temperature ranges from around 10 °C (50 °F) in January to around 27 °C (80 °F) in July and August. Here are the average temperatures.

Being a short distance from the mainland, the island is subject to outbreaks of cold air in winter, while in late spring and summer, it may occasionally receive some showers or thunderstorms coming from the same continent.
The island's interior is covered with hills, which reach about 400 meters (1,300 feet) above sea level, and it's green. The airport is located a short distance from the main town, and the track is a few steps away from both the sea and the harbor.



Rainfall follows the Mediterranean pattern, so it is more frequent from October to April, and is not abundant, since it amounts to 630 millimeters (24.8 inches) per year. As mentioned, rainfall is rare in summer, and occurs in the form of short showers or thunderstorms. Here is the average precipitation.

Winter, from December to mid-March, is quite mild: the maximum temperature is on average about 12/13 °C (54/55 °F), but there can be milder periods, with highs around 15/18 °C (59/64 °F), and cold periods, when highs remain around 5/7 °C (41/45 °F), and with a moderate or even strong wind that heightens the feeling of cold. In addition, sometimes, and not too infrequently, it can snow, and there may be frosts at night.
The rains are quite frequent; the rainiest month is December.

Spring, from mid-March to May, is mild, though with some periods a bit cold, windy and rainy, which gradually become less frequent.

Summer, from June to mid-September, is hot and sunny, with rare showers. Typically, the maximum temperatures hover around 30 °C (86 °F) and rarely exceed 33/34 °C (91/93 °F), sometimes, however, there can be short heat waves, in which the temperature can reach 38/40 °C (100/104 °F).

Autumn, from mid-September to November, is pleasantly warm at first, then gradually becomes milder. The rains gradually become more frequent, although in September and the first half of October, there are still entire weeks without rain. In November, the first days a bit cold and windy begin to occur, and sometimes also in October.



The amount of sunshine in Skiathos is very good in summer, when clear skies prevail, and it is also good in May and September, while in the rest of the year, there are both sunny periods and periods with cloudy skies. Here are the average sunshine hours per day.

The temperature of the sea, still cold in May and cool in June, becomes high enough for swimming from July to September, when it reaches 24/25 °C (75/77 °F). Here are the average sea temperatures.

Best Time

The best time to go to Skiathos for a beach holiday is summer, from June to mid-September. In June, and sometimes in early July, there can be some cool evenings, so it's better to bring a sweatshirt for the evening.
In May, not only the sea is cold, but there can also be some cool days for sunbathing, with highs below 20 °C (68 °F), especially in the first part of the month.
If you want to go on excursions on the island, you can choose May and September.

Back to the Sporades Islands.

Skiathos - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Skiathos is usually mild. The average temperature is of 9.8 °C (50 °F), with a minimum of 7.8 °C (46 °F) and a maximum of 11.8 °C (53.2 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (35 °F). However, it dropped to -2.2 °C (28 °F) in January 2017.
On the warmest days of the month, the temperature usually reaches around 17.5 °C (64 °F). However, it reached 22 °C (71.6 °F) in January 1995.
Precipitation amounts to 80 mm (3.1 in), distributed over 10 days.
The day lasts on average 9 hours and 50 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 14.5 °C (57.5 °F). Therefore, the sea is very cold for swimming.

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In February, the weather in Skiathos is usually mild. The average temperature is of 10.4 °C (51 °F), with a minimum of 8.4 °C (47.2 °F) and a maximum of 12.4 °C (54.3 °F).
On the coldest nights of the month, the temperature usually drops to around 2.5 °C (37 °F). However, it dropped to -2 °C (28.4 °F) in February 2004.
On the warmest days of the month, the temperature usually reaches around 19 °C (66 °F). However, it reached 22 °C (71.6 °F) in February 1995.
Precipitation amounts to 70 mm (2.8 in), distributed over 9 days.
The day lasts on average 10 hours and 50 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 69%.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Skiathos is usually mild. The average temperature is of 12.5 °C (54 °F), with a minimum of 10.5 °C (50.9 °F) and a maximum of 14.4 °C (58 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4.5 °C (40 °F). However, it dropped to 1 °C (33.8 °F) in March 1996.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 21.5 °C (71 °F). However, it reached 31 °C (87.8 °F) in March 2001.
Precipitation amounts to 60 mm (2.4 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 66%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Skiathos is usually very mild. The average temperature is of 15.2 °C (59 °F), with a minimum of 13.1 °C (55.5 °F) and a maximum of 17.3 °C (63.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 7.5 °C (45.5 °F). However, it dropped to 5 °C (41 °F) in April 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23 °C (73 °F). However, it reached 26 °C (78.8 °F) in April 2012.
Precipitation amounts to 40 mm (1.6 in), distributed over 7 days.
The day lasts on average 13 hours and 20 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 67%.
The average wind speed is 8 kph (5 mph).
The average sea temperature is of 14.5 °C (58.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Skiathos is usually warm. The average temperature is of 20.1 °C (68 °F), with a minimum of 17.8 °C (64.1 °F) and a maximum of 22.5 °C (72.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 12 °C (54 °F). However, it dropped to 9 °C (48.2 °F) in May 1992.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 28 °C (82.5 °F). However, it reached 31 °C (87.8 °F) in May 2001.
Precipitation amounts to 40 mm (1.6 in), distributed over 6 days.
The day lasts on average 14 hours and 25 minutes. So the days are long.
There are on average 9.5 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 63%.
The average wind speed is 9 kph (5 mph).
The average sea temperature is of 18 °C (64 °F). Therefore, the sea is cold for swimming.

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In June, the weather in Skiathos is usually warm to hot. The average temperature is of 24.5 °C (76 °F), with a minimum of 22.1 °C (71.7 °F) and a maximum of 27 °C (80.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 17 °C (62 °F). However, it dropped to 14 °C (57.2 °F) in June 1997.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 32.5 °C (90.5 °F). However, it reached 40 °C (104 °F) in June 2007.
Precipitation amounts to 25 mm (1 in), distributed over 4 days.
The day lasts on average 14 hours and 55 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 11 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 60%.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 22 °C (71.5 °F). Therefore, the sea is cool for swimming.

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In July, the weather in Skiathos is usually warm to hot. The average temperature is of 26.7 °C (80 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 29.2 °C (84.5 °F).
On the coldest nights of the month, the temperature usually drops to around 19.5 °C (67.5 °F). However, it dropped to 16 °C (60.8 °F) in July 1992.
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F). However, it reached 43 °C (109.4 °F) in July 2000.
Precipitation amounts to 20 mm (0.8 in), distributed over 2 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.
There are on average 12 hours of sunshine per day. So, the sun shines 83% of the time.
The average humidity is 59%.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 24.5 °C (75.5 °F). Therefore, the sea is warm enough for swimming.

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In August, the hottest month of the year, the weather in Skiathos is usually warm to hot. The average temperature is of 26.8 °C (80 °F), with a minimum of 24.3 °C (75.7 °F) and a maximum of 29.2 °C (84.6 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (67.5 °F). However, it dropped to 17 °C (62.6 °F) in August 1991.
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92 °F). However, it reached 38 °C (100.4 °F) in August 1994.
Precipitation amounts to 25 mm (1 in), distributed over 2 days.
The day lasts on average 13 hours and 35 minutes.
There are on average 11.5 hours of sunshine per day. So, the sun shines 85% of the time.
The average humidity is 60%.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 25 °C (77 °F). Therefore, the sea is warm enough for swimming.

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In September, the weather in Skiathos is usually warm to hot. The average temperature is of 23.0 °C (73 °F), with a minimum of 20.5 °C (68.9 °F) and a maximum of 25.6 °C (78 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 15.5 °C (59.5 °F). However, it dropped to 12 °C (53.6 °F) in September 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 30.5 °C (87 °F). However, it reached 36 °C (96.8 °F) in September 2015.
Precipitation amounts to 40 mm (1.6 in), distributed over 5 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 77% of the time.
The average humidity is 65%.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 24 °C (75 °F). Therefore, the sea is warm enough for swimming.

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In October, the weather in Skiathos is usually warm. The average temperature is of 19.2 °C (67 °F), with a minimum of 17 °C (62.6 °F) and a maximum of 21.4 °C (70.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 12 °C (53.5 °F). However, it dropped to 7 °C (44.6 °F) in October 1997.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 31 °C (87.8 °F) in October 1991.
Precipitation amounts to 70 mm (2.8 in), distributed over 7 days.
The day lasts on average 11 hours and 5 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).
The average sea temperature is of 21 °C (70 °F). Therefore, the sea is cool for swimming.

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In November, the weather in Skiathos is usually very mild. The average temperature is of 15.3 °C (60 °F), with a minimum of 13.4 °C (56.2 °F) and a maximum of 17.1 °C (62.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 8 °C (46 °F). However, it dropped to 4 °C (39.2 °F) in November 1995.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 23.5 °C (74 °F). However, it reached 27 °C (80.6 °F) in November 2000.
Precipitation amounts to 65 mm (2.6 in), distributed over 10 days.
The day lasts on average 10 hours and 0 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 57% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 18 °C (64 °F). Therefore, the sea is cold for swimming.

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In December, the weather in Skiathos is usually mild. The average temperature is of 11.0 °C (52 °F), with a minimum of 9 °C (48.2 °F) and a maximum of 13 °C (55.5 °F).
On the coldest nights of the month, the temperature usually drops to around 3.5 °C (38.5 °F). However, it dropped to 1 °C (33.8 °F) in December 1998.
On the warmest days of the month, the temperature usually reaches around 19 °C (66 °F). However, it reached 23 °C (73.4 °F) in December 2008.
Precipitation amounts to 95 mm (3.7 in), distributed over 12 days.
The day lasts on average 9 hours and 30 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 3.5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 15.5 °C (60.5 °F). Therefore, the sea is cold for swimming.