Portorož
Slovenia
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Portorož, Slovenia

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  • The 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).

  • The 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).

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  • The 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%).

  • The average rainfall in September: 123.8mm

The wettest month (with the highest rainfall) is September (123.8mm).
The driest month (with the lowest rainfall) is February (47.1mm).

  • The 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 lowest number of rainy days is February (7.5 days).

  • The average sea temperature in September: 23.3°C

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).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January and December (Average daylight: 9h).

  • The average sunshine in September: 7.4h

The month with most sunshine is July (Average sunshine: 10.2h).
The month with least sunshine is December (Average sunshine: 3h).

  • The 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, November and December (UV index 1).

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