Rijeka weather in December 2026

Q: How warm is it in Rijeka in December?

Daytime temperatures usually reach 10°C in Rijeka in December, falling to 2°C at night.

Q: How sunny is it in Rijeka in December?

There are normally 3 hours of bright sunshine each day in Rijeka in December - that's 38% of daylight hours.

Q: How warm is the sea around Rijeka in December?

The average sea temperature around Rijeka in December is 16°C.

Q: Does it rain in Rijeka in December?

There are usually 14 days with some rain in Rijeka in December and the average monthly rainfall is 127mm.

Expect daytime maximum temperatures of 5°C in Rijeka, Croatia in December based on long-term weather averages. There are 3 hours of sunshine per day on average with 14 days with some rainfall and typically 131 mm of rainfall in the month, which might fall as snow.

5
5°C max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
-3
-3°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
131
131 mm of monthly rainfall
1
1 (Low) UV index
13
13°C sea temperature

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The December 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)