The climate on this island is healthy and balanced, as Hippocrates himself, the founder of medicine as a science, and the most famous Greek physician, wrote in his three-year stay on the island at the end of 5 century BC.Thanks to its north position, tropical temperatures as on some southern Greek islands are not observed. Also, Thassos is protected from strong winds, which are typical problem of most Greek islands. Even if there is some wind, it is pleasant, slow, refreshing winds. Air is typically never satiate with salt and moisture and it never happens during the warm summer evenings that you trouble breathing and that all that is left outside during the night until the morning gets wet. By that freshness and purity of air Thassos is famous from ancient times.

Average summer air temperatures ranged from 24.5°C in June, 27°C, in July, 26.5°C in August and 25°C in September. In the hottest part of the day during peak summer months, the scale on the thermometer ranges between 30 and 35 divisions.

The average temperature in summer is around 25°C, which makes swimming a true pleasure.

Rainfall during the summer is rare. Heavy downpour occurs once in a while, especially in the north of the island over the mountain range, which often, by the time it reaches the southern part grows into a light rain, or even completely stops.

The average air temperature in winter is between 8 and 10°C above zero. However, as the sun shines every day for at least four hours during the winter months, the climate is still very pleasant and beneficial. Snowfalls are rare, except on the tops of the mountain range, but they are certainly recorded.

Fall and spring on this island are particularly good for outdoor activities, because the temperatures are very pleasant, and rainy period is very short.

According to many, Thassos is the most beautiful in the late spring and early summer, because of ideal temperatures, lush vegetation and thousands of colors that adorn its landscape.