Skiathos is characterised by a Mediterranean climate with hot, dry summers and is the island least affected by the strong Meltemi wind.
The good weather lasts until October when the first rainfall affects the island and temperatures often reach 29 degrees and never fall below 20.
July and August are the months when temperatures reach their highest peaks but during the night the air tends to cool down, even if only slightly.
The sea that washes the island of Skiathos is ideal for swimming from May to September when the more than 10 hours of sunshine per day make it particularly warm.
The hottest months of the year in Skiathos are June, July and August, when the monthly average temperature reaches 29 °C, while the coldest months of February and January the thermometer drops up to 2 °C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max °C | 10 | 11 | 13 | 18 | 23 | 27 | 29 | 29 | 26 | 20 | 16 | 11 |
| Min °C | 2 | 3 | 4 | 7 | 11 | 15 | 18 | 18 | 15 | 11 | 8 | 4 |
In Skiathos rainiest months of the year are January and December during which monthly rainfall average reaches 95 mm. On the other side, driest months are June, August and July when the average rainfall is reduced to 22 mm per month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 82 | 70 | 59 | 38 | 39 | 26 | 22 | 26 | 38 | 71 | 65 | 95 |
| Days |
May, June, August and July are sunniest months of the year. During that months, from sunrise to sunset there are 12 total sunshine hours in Skiathos. In February, December and January sunshine hours are reduced to 4.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 4 | 5 | 7 | 9 | 10 | 10 | 12 | 10 | 9 | 8 | 7 | 5 |
Months of the year when sea water is warmer are July, September and August, average temperature is around 25 °C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 15 | 15 | 14 | 15 | 18 | 22 | 24 | 25 | 24 | 21 | 19 | 17 |