Opatija
Croatia
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Opatija, Croatia

May, the last month of the spring, in Opatija, is an enjoyable month, with average temperature fluctuating between 8°C (46.4°F) and 18°C (64.4°F).

Temperature

In May, the average high-temperature increases, from a moderate 13°C (55.4°F) in April, to an enjoyable 18°C (64.4°F). The average low-temperature, in May, is 8°C (46.4°F).

Rainfall

In Opatija, it is raining for 16 days, with typically 110mm (4.33") of accumulated precipitation. Throughout the year, there are 170 rainfall days, and 1471mm (57.91") of precipitation is accumulated.

Sea temperature

In Opatija, the average water temperature is 18°C (64.4°F).
Note: For swimming, a surface water temperature of 18°C (64.4°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

In May, the average length of the day in Opatija is 14.9h.

Sunshine

In Opatija, the average sunshine is 8h.

UV index

In May, the average daily maximum UV index in Opatija, Croatia, is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in May transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in May in Opatija?

In May, in Opatija, the average high-temperature is 18°C (64.4°F), and the average low-temperature is 8°C (46.4°F).

How much does it rain in Opatija in May?

In Opatija, Croatia, during May, the rain falls for 16 days and regularly aggregates up to 110mm (4.33") of precipitation.

How cold is the water in May in Opatija?

In Opatija, the average seawater temperature in May is 18°C (64.4°F). Swimming in 18°C (64.4°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

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

The average length of the day in May in Opatija is 14.9h.

How long on average sun shines in May in Opatija?

The average sunshine in May is 8h.

What is the UV index reading in May in Opatija?

The average daily maximum UV index in May is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Opatija, Croatia
  • Average high temperature in May: 18°C

Warmest months (with the highest average high temperature) are July and August (25°C).
Months with the lowest average high temperature are January and February (6°C).

  • Average low temperature in May: 8°C

Months with the highest average low temperature are July and August (13°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

Average rainfall in May - Opatija, Croatia
  • Average rainfall in May: 110mm

The wettest month (with the highest rainfall) is November (178mm).
The driest month (with the lowest rainfall) is July (88mm).

Average rainfall days in May - Opatija, Croatia
  • Average rainfall days in May: 16 days

Months with the highest number of rainy days are April, May and June (16 days).
Months with the lowest number of rainy days are February, July, August, September and October (13 days).

Average sea temperature in May - Opatija, Croatia
  • Average sea temperature in May: 18°C

The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (10.7°C).

Average daylight in May / Average sunshine in May - Opatija, Croatia
  • Average daylight in May: 14.9h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in May: 8h

The month with most sunshine is July (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 3h).

Average UV index in May - Opatija, Croatia
  • Average UV index in May: 7

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).