September weather forecast
Heraklion, Greece

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The Venetian walls and the Castle of Koule in the shipyards at Heraklion, Greece
The Venetian walls and the Castle of Koule in the shipyards at Heraklion, Greece

Weather in September

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.

Frequently asked questions

What are September temperatures in Heraklion?

The average high-temperature, in September, in Heraklion, is 26.4°C (79.5°F), while the average low-temperature is 20.3°C (68.5°F).

How many days does it rain in September in Heraklion?

In September, in Heraklion, the rain falls for 1.3 days. Throughout September, 20mm (0.79") of precipitation is accumulated.

What is the water temperature in September in Heraklion?

In Heraklion, Greece, in September, the average water temperature is 25.4°C (77.7°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Heraklion have in September?

The average day length in September is 12h and 24min.

When is the sunrise / sunset in September in Heraklion?

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

How long on average sun shines in September in Heraklion?

In September, the average sunshine duration in Heraklion, Greece, is 9.4h.

What is the UV index intensity in September in Heraklion?

In September, the average daily maximum UV index in Heraklion is 8. A UV Index estimate of 8 to 10 represents a very high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Heraklion, Greece

Average temperature in September - Heraklion, Greece
  • Average high temperature in September: 26.4°C

The warmest month (with the highest average high temperature) is July (28.6°C).
The month with the lowest average high temperature is January (15.2°C).

  • Average low temperature in September: 20.3°C

The months with the highest average low temperature are July and August (22.7°C).
The coldest months (with the lowest average low temperature) are January and February (10°C).

Average rainfall in September
Heraklion, Greece

Average rainfall in September - Heraklion, Greece
  • Average rainfall in September: 19.5mm

The wettest month (with the highest rainfall) is January (91.5mm).
The driest month (with the least rainfall) is August (0.7mm).

Average rainfall days in September
Heraklion, Greece

Average rainfall days in September - Heraklion, Greece
  • Average rainfall days in September: 1.3 days

The month with the highest number of rainy days is January (10.1 days).
The months with the least rainy days are July and August (0.1 days).

Average sea temperature in September
Heraklion, Greece

Average sea temperature in September - Heraklion, Greece
  • Average sea temperature in September: 25.4°C

The best month for swimming (with the highest average sea temperature) is August (26.1°C).
The coldest month (with the lowest average sea temperature) is February (16.4°C).

Average daylight in September /
Average sunshine in September
Heraklion, Greece

Average daylight in September / Average sunshine in September - Heraklion, Greece
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average UV index in September
Heraklion, Greece

Average UV index in September - Heraklion, Greece
  • Average UV index in September: 8

The month with the highest UV index is July (UV index 11).
The month with the lowest UV index is December (UV index 2).

Heraklion, Greece

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