Rijeka weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Rijeka in September. Check more long-term weather averages for Rijeka in September before you book your next holiday to Croatia in 2025/2026.

  • 20°C maximum daytime temperature in September in Rijeka20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 13 days with some rainfall in September in Rijeka13
    13 days with some rainfall
  • 9°C minimum night-time temperature in September in Rijeka9
    9°C min night temperature
  • 13 hours of daylight per day in September in Rijeka13
    13 hours of daylight per day
  • No heat & humidity in September in Rijeka0
    No heat & humidity
  • 143 mm monthly rainfall in September in Rijeka143
    143 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Rijeka5
    5 (Moderate) UV index
  • 21°C sea temperature in September in Rijeka21
    21°C sea temperature

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The September weather guide for Croatia (Rijeka) 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)

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More about Croatia

How hot is it in Rijeka in September?

Daytime temperatures usually reach 20°C in Rijeka in September, falling to 9°C at night.

How sunny is it in Rijeka in September?

There are normally 7 hours of bright sunshine each day in Rijeka in September - that's 52% of daylight hours.

How warm is the sea around Rijeka in September?

The average sea temperature around Rijeka in September is 21°C.

Does it rain in Rijeka in September?

There are usually 13 days with some rain in Rijeka in September and the average monthly rainfall is 143mm.

Rijeka September sunrise & sunset times

Browse the sunrise and sunset times for Rijeka in September 2025. Select a month to view Rijeka 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 18:13
Tuesday, 30th September 2025 05:59 17:44

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