Contents
Weather in September
Temperature
The transition into September in Portorož, Slovenia, is accompanied by a slight temperature decrease, with the average high-temperature shifting from a moderately hot 28.2°C (82.8°F) in August to a still warm 23.9°C (75°F). In Portorož, September nights cool down to an average of 13°C (55.4°F).Humidity
In September, the average relative humidity in Portorož is 57%.Rainfall
The month with the most rainfall in Portorož is September, when the rain falls for 8.5 days and typically aggregates up to 124mm (4.88") of precipitation.Sea temperature
In September, the average sea temperature is 23.3°C (73.9°F).Note: For someone not comfortable with cold, swimming in 23.3°C (73.9°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
In Portorož, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 06:27 and sunset at 19:43. On the last day of the month, sunrise is at 07:03 and sunset at 18:47 CEST.
Sunshine
The average sunshine in September in Portorož is 7.4h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Caution! The mirror effect of sand and water ups the UV radiation strength.
Frequently asked questions
What is the temperature in September in Portorož?
What is the average humidity in September in Portorož?
What is the rainiest month in Portorož?
How much does it rain in Portorož in September?
What is the sea temperature in September in Portorož?
How many hours of daylight does Portorož have in September?
What time are sunrise and sunset in September in Portorož?
How long on average sun shines in September in Portorož?
What is the UV index reading in September in Portorož?
Average temperature in September
Portorož, Slovenia
- Average high temperature in September: 23.9°C
The warmest month (with the highest average high temperature) is July (28.4°C).
The month with the lowest average high temperature is January (8.6°C).
- Average low temperature in September: 13°C
The month with the highest average low temperature is July (16.5°C).
The coldest month (with the lowest average low temperature) is February (0.4°C).
Average humidity in September
Portorož, Slovenia
- Average humidity in September: 57%
The month with the highest relative humidity is January (68%).
The month with the lowest relative humidity is July (50%).
Average rainfall in September
Portorož, Slovenia
- Average rainfall in September: 123.8mm
The wettest month (with the highest rainfall) is September (123.8mm).
The driest month (with the least rainfall) is February (47.1mm).
Average rainfall days in September
Portorož, Slovenia
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (11 days).
The month with the least rainy days is February (7.5 days).
Average sea temperature in September
Portorož, Slovenia
- Average sea temperature in September: 23.3°C
The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).
Average daylight in September /
Average sunshine in September
Portorož, Slovenia
- 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: 7h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 0min).
Average UV index in September
Portorož, Slovenia
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 1).
Portorož, Slovenia
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