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

September weather forecast and climate
Opatija, Croatia

The first month of the autumn, September, is also an agreeable month in Opatija, Croatia, with average temperature varying between 21°C (69.8°F) and 10°C (50°F).

Temperature

In Opatija, the average high-temperature slightly decreases, from a moderately hot 25°C (77°F) in August, to a pleasant 21°C (69.8°F). The average low-temperature, is 10°C (50°F).

Rainfall

In Opatija, Croatia, in September, during 13 rainfall days, 138mm (5.43") of precipitation is typically accumulated. In Opatija, during the entire year, the rain falls for 170 days and collects up to 1471mm (57.91") of precipitation.

Sea temperature

In September, the average sea temperature in Opatija is 23.4°C (74.1°F).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23.4°C (74.1°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)

Daylight

In September, the average length of the day is 12.5h.

Sunshine

In Opatija, the average sunshine is 7h.

UV index

In Opatija, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Opatija?

The average high-temperature, in September, is 21°C (69.8°F), while the average low-temperature is 10°C (50°F).

How many days does it rain in September in Opatija?

In Opatija, Croatia, in September, during 13 rainfall days, 138mm (5.43") of precipitation is typically accumulated.

What is the water temperature in September in Opatija?

In Opatija, the average seawater temperature in September is 23.4°C (74.1°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.4°C (74.1°F) water.

How many hours of daylight does Opatija have in September?

In Opatija, Croatia, the average length of the day in September is 12.5h.

How long on average sun shines in September in Opatija?

In September, the average sunshine in Opatija, Croatia, is 7h.

What is the UV index intensity in September in Opatija?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Opatija, Croatia
  • Average high temperature in September: 21°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 September: 10°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 September - Opatija, Croatia
  • Average rainfall in September: 138mm

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

Average rainfall days in September - Opatija, Croatia
  • Average rainfall days in September: 13 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 September - Opatija, Croatia
  • Average sea temperature in September: 23.4°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 September / Average sunshine in September - Opatija, Croatia
  • Average daylight in September: 12.5h

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 September: 7h

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

Average UV index in September - Opatija, Croatia
  • Average UV index in September: 5

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).