Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Opatija in September experiences a gentle temperature dip, with average high-temperatures reducing from a warm 26.9°C (80.4°F) in August to an agreeable 22.5°C (72.5°F). The temperature in Opatija during September nights demonstrates a small drop from the daytime highs, settling to an average of 18.9°C (66°F).Humidity
In September, the average relative humidity is 69%.Rainfall
In Opatija, in September, it is raining for 12.8 days, with typically 84mm (3.31") of accumulated precipitation. Throughout the year, 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 Opatija, the average seawater temperature in September is 23.4°C (74.1°F).Note: For someone not comfortable with cold, swimming in 23.4°C (74.1°F) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.
Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 06:24 and sunset at 19:40. On the last day of September, sunrise is at 07:00 and sunset at 18:44 CEST.
Sunshine
The average sunshine in September is 10.4h.UV index
In Opatija, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
Frequently asked questions
What are September temperatures in Opatija?
What is the average humidity in September in Opatija?
How much does it rain in Opatija in September?
When it does not snow in Opatija?
What is the water temperature in September in Opatija?
How many hours of daylight does Opatija have in September?
When are sunrise and sunset in September in Opatija?
How many hours of sunshine does Opatija have in September?
What is the UV index reading in September in Opatija?
Average temperature in September
Opatija, Croatia
- Average high temperature in September: 22.5°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 September: 18.9°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 September
Opatija, Croatia
- Average pressure in September: 1016.6mbar
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 September
Opatija, Croatia
- Average wind speed in September: 13.3km/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 September
Opatija, Croatia
- Average humidity in September: 69%
The month with the highest relative humidity is November (76%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
Opatija, Croatia
- Average rainfall in September: 84mm
The wettest month (with the highest rainfall) is November (89mm).
The driest month (with the least rainfall) is January (35mm).
Average rainfall days in September
Opatija, Croatia
- Average rainfall days in September: 12.8 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 September
Opatija, Croatia
- Average snowfall in September: 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 September
Opatija, Croatia
- Average snowfall days in September: 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 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: 12h and 3min
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 September: 10h and 2min
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 September
Opatija, Croatia
- Average sunshine days in September: 14.9 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 September
Opatija, Croatia
- Average UV index in September: 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 September
Opatija, Croatia
- Average cloud cover in September: 25
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 September
Opatija, Croatia
- Average visibility in September: 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).
Opatija, Croatia
Weather forecast for your location
2. Allow the app to use your location
