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Portoroz weather in September 2025
Expect 24°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Portoroz in September. Check more long-term weather averages for Portoroz in September before you book your next holiday to Slovenia in 2025/2026.
- 2424°C max day temperature
- 7 hours of sunshine per day
- 1111 days with some rainfall
- 1414°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 118118 mm of monthly rainfall
- 55 (Moderate) UV index
- 2222°C sea temperature
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Recommended for Slovenia
The September weather guide for Slovenia (Portoroz) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about Slovenia
How hot is it in Portoroz in September?
Daytime temperatures usually reach 24°C in Portoroz in September, falling to 14°C at night.
How sunny is it in Portoroz in September?
There are normally 7 hours of bright sunshine each day in Portoroz in September - that's 54% of daylight hours.
How warm is the sea around Portoroz in September?
The average sea temperature around Portoroz in September is 22°C.
Does it rain in Portoroz in September?
There are usually 11 days with some rain in Portoroz in September and the average monthly rainfall is 118mm.
Portoroz September sunrise & sunset times
Browse the sunrise and sunset times for Portoroz in September 2025. Select a month to view Portoroz sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:27 | 18:43 |
Monday, 15th September 2025 | 05:44 | 18:17 |
Tuesday, 30th September 2025 | 06:03 | 17:48 |
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