If you would like to visit Skiathos for vacations, you don't need to think about the time of the year you'll be there because the island is incredibly beautiful and it is always a good time to visit it.
Unlike the famous Cyclades with the very hot and dry climate, Skiathos has a typical Mediterranean climate with hot summers and mild winters.
Skiathos is a small Greek island in the northwest Aegean Sea, east of the Mount Pelion, hence its climate and weather is very affected by the mountainous climate of the area.
In summer, from June to mid-September, the island is hot and sunny with rare showers. The typical Temperature is around 30°C during the day, but it can easily exceed 37°C in the hottest period. In fact, the island is full of trees that make extreme heat bearable. Also all Skiathos hotels have air-conditioning system, so don’t worry about that. During the summertime, there is frequently a refreshing breeze which also makes your stay more pleasant. In June sometimes there can be some cool evenings, so it is better to bring a sweatshirt for the evening. A unique characteristic in the summer is the strong winds, the so-called Meltemia. All these are usual of the Aegean and you'll have to take them into consideration as regards clothing and boat trips, particularly if you are going to visit the island in July and August. If you enjoy sunbathing and desire a nice deep tan, then visiting Skiathos at the summer is the correct time for you.
If you are eager to explore the island in Spring you will be excited by the captivating colors the blossoming flowers and the verdant mountainous sceneries. The weather is almost as warm as in summer time with the average temperature being approximately 17-20°C during the daytime. Despite the fact that the temperature is high enough to enjoy the sun without getting sunburn, the water is still quite cold to go swimming in contrast with the warm temperature of the sea at the start of autumn, especially in September.
As for the rainfall is rare in the summer and occurs occasionally in the form of short showers and more rarely thunderstorms. The heaviest rainfall is more frequent from October to April and amounts to 101-200milimeters per year.
The winter in Skiathos is peaceful. The weather on the island may not be ideal for swimming, but it is still mostly sunny apart from a few days of rain and strong storms. Sometimes it can even snow making an even more picturesque the landscape.