Weather in Skiathos in September 2025
Average weather
Average temperature in Skiathos in September
Going from a maximum of +28°C during the day to a minimum of +20°C during the night, the temperature in September averages around +25°C.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +27°C to +25°C.
Is Skiathos warm or cold in September?
Skiathos is typically warm in September.
Maximum temperatures go down compared to the previous month from +27°C to +24°C. The minimum temperature also goes down from +25°C to +22°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Skiathos:
Water temperature in Skiathos in September
Water in Skiathos in September is Comfortable. It varies from +22°C to +27°C, with an average of +25°C. Note that the air temperature is lower than the water temperature, averaging around +24°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Skiathos in September?
Climate in Skiathos in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +27°C | +24°C | +20°C | ||||
| Min. temperature | ||||||
| +18°C | +16°C | +10°C | ||||
| Max. temperature | ||||||
| +35°C | +33°C | +29°C | ||||
| Rainfall | ||||||
| 22 mm | 52 mm | 76 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +26°C | +25°C | +21°C | ||||
| Humidity | ||||||
| 65% | 69% | 74% | ||||
| Air pressure | ||||||
| 1011 HPa | 1014 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 24 | 16 | 9 | ||||
| Cloudy days | ||||||
| 1 | 5 | 9 | ||||
| Rainy days | ||||||
| 6 | 8 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +27°C in the day, the average maximum temperature lowers to +24°C. Prepare for more rain. Average rainfall goes from 22 mm to 52 mm. Humidity rises from 65% to 69%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 24 sunny days in August to 16 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 14 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in Skiathos is gradually decreasing during September, going from 4 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Skiathos?
Climate Change over Years
The climate in Skiathos in September has not changed much over the last 43 years.
The average temperature was the lowest in 1991 (+18°C) and the highest in 2020 (+21°C). The driest year was 1992 with only 345 mm of rainfall, and the wettest year was 1994 with 974 mm.
FAQ
Is September a good time to visit Skiathos?
Can you sunbathe in Skiathos in September?
Can you swim in Skiathos in September?
Is Skiathos rainy in September?
Is it sunny in Skiathos in September?
Other cities in Greece
Monthly weather in Skiathos
Source of the data
For this page, we’ve looked at the typical weather in Skiathos, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.