If you're looking for summer vibes, the best time to travel to Skiathos is in July, June and August, when the average temperature reaches 25.74 °C, while July, August and June are the 3 sunniest months of the year, with an average of 147.59 hours.
However, if you prefer colder temperatures, make sure you visit Skiathos during January, December or February to experience an average of 9.13 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during July, January and February, when the average precipitation in Skiathos is 4.33 mm, while the months of January, February and March are drier, with an average of 0 mm.