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 (0.79"), 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

Heraklion's average high-temperature marks a still warm 26.4°C (79.5°F) with the advent of September, closely mirroring that of the preceding month. September nights cool down to an average low-temperature of 20.3°C (68.5°F).

Rainfall

In Heraklion, during September, the rain falls for 1.3 days and regularly aggregates up to 20mm (0.79") of precipitation. Throughout the year, in Heraklion, Greece, there are 53.2 rainfall days, and 501mm (19.72") of precipitation is accumulated.

Sea temperature

In Heraklion, Greece, in September, the average water temperature is 25.4°C (77.7°F).
Note: Surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

In Heraklion, Greece, the average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 06:52 and sunset at 19:46. On the last day of the month, sunrise is at 07:13 and sunset at 19:04 EEST.

Sunshine

The average sunshine in September in Heraklion is 9.4h.

UV index

In September, the average daily maximum UV index in Heraklion is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The UV index of 8 during September leads to these advisories:
Always be cautious. Skin and eyes can be affected swiftly without protection. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Boost your sun resistance with garments that are densely woven yet spacious. Warning! The Sun's UV rays intensify with reflections from sand and water.