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Opatija weather in September 2025
Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Opatija in September. Check more long-term weather averages for Opatija in September before you book your next holiday to Croatia in 2025/2026.
- 2121°C max day temperature
- 7 hours of sunshine per day
- 1313 days with some rainfall
- 1010°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 138138 mm of monthly rainfall
- 55 (Moderate) UV index
- 2121°C sea temperature
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The September weather guide for Croatia (Opatija) 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 Croatia
How hot is it in Opatija in September?
Daytime temperatures usually reach 21°C in Opatija in September, falling to 10°C at night.
How sunny is it in Opatija in September?
There are normally 7 hours of bright sunshine each day in Opatija in September - that's 53% of daylight hours.
How warm is the sea around Opatija in September?
The average sea temperature around Opatija in September is 21°C.
Does it rain in Opatija in September?
There are usually 13 days with some rain in Opatija in September and the average monthly rainfall is 138mm.
Opatija September sunrise & sunset times
Browse the sunrise and sunset times for Opatija in September 2025. Select a month to view Opatija sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:24 | 18:40 |
Monday, 15th September 2025 | 05:41 | 18:14 |
Tuesday, 30th September 2025 | 06:00 | 17:45 |
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