Heraklion
Greece
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
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
May, the last month of the spring, in Heraklion, is a moderately hot month, with average temperature fluctuating between 23.5°C (74.3°F) and 15.9°C (60.6°F).

Temperature

In May, the average high-temperature slightly increases, from a pleasant 20.2°C (68.4°F) in April, to a warm 23.5°C (74.3°F). In Heraklion, the average low-temperature is 15.9°C (60.6°F).

Rainfall

In Heraklion, during 1.9 rainfall days, 15.2mm (0.6") of precipitation is typically accumulated. In Heraklion, during the entire year, the rain falls for 53.2 days and collects up to 500.6mm (19.71") of precipitation.

Sea temperature

In Heraklion, the average seawater temperature is 19.5°C (67.1°F).
Note: For swimming, a surface water temperature of 19.5°C (67.1°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

The average length of the day in Heraklion is 14h.

Sunshine

The average sunshine is 9.7h.

UV index

In Heraklion, Greece, the average daily maximum UV index in May is 9. A UV Index reading of 8 to 10 represents a very high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 9 interpret into the following advice:
Take extra precautions. Protection against sun damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Heraklion?

In Heraklion, in May, the average high-temperature is 23.5°C (74.3°F), and the average low-temperature is 15.9°C (60.6°F).

How much does it rain in Heraklion in May?

In Heraklion, during May, the rain falls for 1.9 days and regularly aggregates up to 15.2mm (0.6") of precipitation.

What is the sea water temperature in May in Heraklion?

In May, the average sea temperature is 19.5°C (67.1°F). For swimming, a surface water temperature of 19.5°C (67.1°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in May in Heraklion?

The average length of the day in May in Heraklion is 14h.

How many hours of sunshine does Heraklion have in May?

The average sunshine in May in Heraklion, Greece, is 9.7h.

What is the UV index reading in May in Heraklion?

In May, the average daily maximum UV index is 9. A UV Index value of 8 to 10 symbolizes a very high hazard to health from the exposure to the Sun's UV rays.
Average temperature in May - Heraklion, Greece
  • Average high temperature in May: 23.5°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 May: 15.9°C

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

Average rainfall in May - Heraklion, Greece
  • Average rainfall in May: 15.2mm

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

Average rainfall days in May - Heraklion, Greece
  • Average rainfall days in May: 1.9 days

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

Average sea temperature in May - Heraklion, Greece
  • Average sea temperature in May: 19.5°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 May / Average sunshine in May - Heraklion, Greece
  • Average daylight in May: 14h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in May: 9.7h

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

Average UV index in May - Heraklion, Greece
  • Average UV index in May: 9

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