May weather forecast
Heraklion, Greece

May brings a pronounced increase in both daylight hours and heat, demonstrating a true spring atmosphere. Sunshine duration extends to 9.7 hours, and combined with a sea temperature of 19.5°C, it makes for an ideal climate for outdoor activities. Compared to April, rainfall reduces drastically, making cloudy days an anomaly. As Heraklion shifts closer to its peak summer conditions, anticipate a significant rise in temperatures by June. Despite these changes, sun protection remains imperative, as May showcases a higher UV index.

Temperature

Heraklion's transition into May sees a mild rise in the average high-temperature, edging from an agreeable 20.2°C in April to a warm 23.5°C. Heraklion anticipates an average minimum temperature of 15.9°C in the month of May.

Rainfall

In Heraklion, during May, the rain falls for 1.9 days and regularly aggregates up to 15mm of precipitation. In Heraklion, Greece, 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 May is 19.5°C.
Note: The majority of individuals do not enjoy swimming in water that is 19.5°C. Breathing control becomes more challenging as the water temperature dips from 21°C to 15°C.

Daylight

The average length of the day in May in Heraklion is 14h and 2min.
On the first day of the month, sunrise is at 06:28 and sunset at 20:04. On the last day of May, sunrise is at 06:06 and sunset at 20:28 EEST.

Sunshine

In Heraklion, the average sunshine in May is 9.7h.

UV index

The average daily maximum UV index in May in Heraklion is 9. 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: In May, a regular UV index of 9 translates into these guidelines:
Prioritize protection; rapid damage can occur to unprotected eyes and skin. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.