September weather forecast
Santorini, Greece

September marks the beginning of autumn in Santorini, though pleasant summer conditions largely persist. Clear days prevail, and temperatures start to descend subtly from their summertime highs. The sea continues to remain warm, showing little change from August, thus maintaining its attractiveness for sea enthusiasts. While the sunshine and daylight hours show a downward trend, they still allow ample time for outdoor activities. The decreasing UV index of 7 reflects the diminishing intensity of the sun.

Temperature

Transitioning into September, Santorini experiences an average high-temperature of a still moderately hot 25°C (77°F), marking a minor shift from the preceding month. Santorini sees a gentle drop from the daily peak temperature in September, with an average low settling at an agreeable 20°C (68°F).

Rainfall

In Santorini, in September, during 1 rainfall days, 13mm (0.51") of precipitation is typically accumulated. Throughout the year, there are 65 rainfall days, and 554mm (21.81") of precipitation is accumulated.

Sea temperature

In Santorini, the average seawater temperature in September is 24.6°C (76.3°F).
Note: For someone not comfortable with cold, swimming in 24.6°C (76.3°F) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September in Santorini, Greece, sunrise is at 06:49 and sunset at 19:46. On the last day of the month, sunrise is at 07:12 and sunset at 19:03 EEST.

Sunshine

In Santorini, the average sunshine in September is 10h.

UV index

In Santorini, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.
Note: A daily high UV index of 7 in September leads to these guidelines:
Shield from overexposure. Defense against sun-related harm is required. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.