September weather forecast
Heraklion, Greece

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, the first month of the autumn in Heraklion, is still a warm month, with an average temperature varying between 26.4°C (79.5°F) and 20.3°C (68.5°F).
An excellent water temperature of 25.4°C (77.7°F) and only 1.3 rainfall days, with 19.5mm (0.77") of accumulated rainfall, makes September a prime for swimming and other water activities.

Temperature

In Heraklion, the average high-temperature in September is practically the same as in August - a still warm 26.4°C (79.5°F). In Heraklion, in September, the average low-temperature is 20.3°C (68.5°F).

Rainfall

In Heraklion, during 1.3 rainfall days, 19.5mm (0.77") of precipitation is typically accumulated. Throughout the year, in Heraklion, there are 53.2 rainfall days, and 500.6mm (19.71") of precipitation is accumulated.

Sea temperature

In Heraklion, Greece, the average water temperature is 25.4°C (77.7°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

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

Sunshine

The average sunshine in September is 9.4h.

UV index

In Heraklion, Greece, the average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high health hazard from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 8 in September transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

How much does it rain in Heraklion in September?

In Heraklion, during September, the rain falls for 1.3 days and regularly aggregates up to 19.5mm (0.77") of precipitation.

How warm is the water in September in Heraklion?

In Heraklion, 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 in Heraklion is 12h and 24min.

When are sunrise and sunset in September in Heraklion?

In September, on the first day of the month, sunrise is at 06:51 and sunset at 19:47. On the last day of the month, in Heraklion, Greece, sunrise is at 07:13 and sunset at 19:05 EEST.

How many hours of sunshine does Heraklion have in September?

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

What is the UV index reading in September in Heraklion?

In September, the average daily maximum UV index in Heraklion is 8. A UV Index value of 8 to 10 symbolizes 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).

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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).

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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).

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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).

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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 24min

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 49min).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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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).

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