May weather forecast
Opatija, Croatia

May

Weather in May

May stands out as one of the warmer months, a precursor to the summer season in Opatija. Lengthier daylight and sunny days become more frequent, enhancing the appeal of outdoor activities. A combination of higher temperatures and less humidity reduces the nippiness experienced in previous months. The wind pace slows down, diminishing the wind chill effect. Nonetheless, the month witnesses a significant leap in sea temperature to 18°C (64.4°F), making it enticing for brave swimmers.

Temperature

May's arrival in Opatija brings a modest temperature shift, moving from a mild 15.4°C (59.7°F) in April to a comfortable 19°C (66.2°F). Throughout May, Opatija records a steady low-temperature average of 15°C (59°F), a minor decrease from its daytime counterpart.

Humidity

In Opatija, the average relative humidity in May is 72%.

Rainfall

In Opatija, in May, during 17 rainfall days, 67mm (2.64") of precipitation is typically accumulated. Throughout the year, in Opatija, there are 157.3 rainfall days, and 720mm (28.35") of precipitation is accumulated.

Snowfall

January, April through November are months without snowfall in Opatija.

Sea temperature

In May, the average sea temperature is 18°C (64.4°F).
Note: In water with a temperature of 18°C (64.4°F), most individuals do not find swimming enjoyable. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), breathing control becomes more difficult.

Daylight

In May, the average length of the day is 14h and 54min.
On the first day of May in Opatija, sunrise is at 05:50 and sunset at 20:09. On the last day of the month, sunrise is at 05:18 and sunset at 20:42 CEST.

Sunshine

The average sunshine in May in Opatija is 10.5h.

UV index

In May, the average daily maximum UV index in Opatija is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum daily UV index of 5 during May morphs into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Frequently asked questions

What are the temperatures in Opatija in May?
The average high-temperature, in May, in Opatija, is 19°C (66.2°F), while the average low-temperature is 15°C (59°F).
What is the average humidity in May in Opatija?
In May, the average relative humidity is 72%.
How many days does it rain in May in Opatija?
In Opatija, during May, the rain falls for 17 days and regularly aggregates up to 67mm (2.64") of precipitation.
When it does not snow in Opatija?
In Opatija, Croatia, snow does not fall in January, April through November.
What is the sea water temperature in May in Opatija?
In May, the average sea temperature is 18°C (64.4°F). For most, swimming in 18°C (64.4°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
How many hours of daylight does Opatija have in May?
The average day length in May is 14h and 54min.
When is the sunrise / sunset in May in Opatija?
In May, on the first day of the month, sunrise is at 05:50 and sunset at 20:09. On the last day of the month, in Opatija, sunrise is at 05:18 and sunset at 20:42 CEST.
How long on average sun shines in May in Opatija?
The average sunshine duration in May in Opatija is 10.5h.
What is the UV index reading in May in Opatija?
In Opatija, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in May
Opatija, Croatia
  • Average high temperature in May: 19°C

The warmest month (with the highest average high temperature) is August (26.9°C).
The month with the lowest average high temperature is January (8.5°C).

  • Average low temperature in May: 15°C

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (5.6°C).

Average pressure in May
Opatija, Croatia
  • Average pressure in May: 1014.4mbar

The month with the highest atmospheric pressure is December (1019.5mbar).
The month with the lowest atmospheric pressure is July (1014.3mbar).

Average wind speed in May
Opatija, Croatia
  • Average wind speed in May: 12.4km/h

The windiest month (with the highest average wind speed) is February (16.7km/h).
The calmest month (with the lowest average wind speed) is July (10.9km/h).

Average humidity in May
Opatija, Croatia
  • Average humidity in May: 72%

The month with the highest relative humidity is November (76%).
The month with the lowest relative humidity is August (66%).

Average rainfall in May
Opatija, Croatia
  • Average rainfall in May: 67mm

The wettest month (with the highest rainfall) is November (89mm).
The driest month (with the least rainfall) is January (35mm).

Average rainfall days in May
Opatija, Croatia
  • Average rainfall days in May: 17 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is August (11.1 days).

Average snowfall in May
Opatija, Croatia
  • Average snowfall in May: 0mm

The months with the highest snowfall are February, March and December (1mm).
The months with the least snowfall are January, April, May, June, July, August, September, October and November (0mm).

Average snowfall days in May
Opatija, Croatia
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 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: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in May: 10h and 3min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 18min).

Average sunshine days in May
Opatija, Croatia
  • Average sunshine days in May: 9.9 days

The month with the most sunshine days is March (17.5 days).
The month with the least sunshine days is May (9.9 days).

Average UV index in May
Opatija, Croatia
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).

Average cloud cover in May
Opatija, Croatia
  • Average cloud cover in May: 31

The months with the most cloud cover are January and February (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 16).

Average visibility in May
Opatija, Croatia
  • Average visibility in May: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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