September weather forecast
Heraklion, Greece

September in Heraklion signals the onset of autumn with gradually dipping temperatures. A relatively dry month, rainfall remains minimal at 20mm, slightly higher than August's record. The sea stays warm enough for swimming and other activities while the sun shines generously, though less than August. UV levels start decreasing, however, sun protection remains necessary before heading out, especially during midday. As we move into October, expect cooler temperatures and an increase in rainfall.

Temperature

The advent of September in Heraklion reveals an average high-temperature of a still warm 26.4°C, showing minimal difference from the prior month. The temperature dips to an average of 20.3°C during September nights.

Rainfall

In Heraklion, in September, it is raining for 1.3 days, with typically 20mm of accumulated precipitation. In Heraklion, during the entire year, the rain falls for 53.2 days and collects up to 501mm of precipitation.

Sea temperature

In Heraklion, the average seawater temperature in September is 25.4°C.
Note: Engaging in water activities, such as swimming or diving, in temperatures from 25°C to 29°C is very pleasurable for extended periods, without any discomfort.

Daylight

The average length of the day in September is 12h and 24min.
On the first day of September in Heraklion, sunrise is at 06:51 and sunset at 19:47. On the last day of the month, sunrise is at 07:13 and sunset at 19:05 EEST.

Sunshine

The average sunshine in September in Heraklion is 9.4h.

UV index

The average daily maximum UV index in September in Heraklion, Greece, is 8. A UV Index of 8 to 10 symbolizes a very high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 8 in September translates into the following recommendations:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be wary! Reflections from sand and water make UV radiation more intense.