Opatija Weather in December

Thinking of visiting Opatija in December? Expect low temperatures reaching 8°C (46°F) during the day, dropping to 2°C (36°F) at night. Heavy showers are common during the rainy season.

Rainfall in Opatija in December

As part of the rainy season, Opatija sees around 14 days of rain in December, with an average of 177 mm (7 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.

Temperature in Opatija in December

December in Opatija brings typical temperatures with highs around 8°C (46°F) and lows of 2°C (36°F). December is part of the winter season. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. Nights fall to 2°C (36°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Opatija in December

The area enjoys a balanced 100 hours of sunlight, ensuring it's neither too rainy nor too sunny.

Average water temperature in December

At 14°C (57°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

December in Opatija has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Croatia, check out our Opatija's climate page.

Opatija Temperature in December

Min Temperature 2°C (36°F)  

Max Temperature 8°C (46°F)  

Water Temperature 14°C (57°F) *  

Chance of Rain 46%  

Precipitation 177 mm (7 in)  

Rainy days 14 days  

Humidity 66% *  

Sunshine 100 hours *  

Percentage Sunshine 39% *  

* Data from: Rijeka, Croatia (7 KM, 4 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Opatija typically stay consistent throughout December, with daily highs averaging around 8°C (46°F). Nights are cold, with lows typically ranging from 2°C (36°F) to 5°C (41°F).

Average temperatures in December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Opatija in December

Browse day-by-day weather records for Opatija spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

‹ January February March April May June July August September October November December ›

Opatija historical weather extremes in December

Based on weather observations in Opatija between 1976 and 2025, these are the recorded extremes during December.

• The warmest day in December was on December 4, 1979, with a maximum of 19°C (66°F).
• Opatija experienced its chilliest December day on December 27, 1996, reaching only -3°C (27°F).
• Opatija registered its coldest December night on December 20, 2009, with temperatures dropping to -10°C (14°F).
• Peak precipitation in December occurred on December 14, 1996, when 102 mm (4 in) of precipitation was measured.

What to Wear in Opatija in December

We recommend to layer up for chilly conditions in Opatija in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. Also bring a poncho, it will rain a lot! Waterproof everything you can. Expect water temperatures of around 14°C (57°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Opatija in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Croatia, check out our Opatija's climate page.

More climate data for Opatija

Temperature Rainfall Sunshine Humidity Water Temp

See the full Opatija climate overview or explore weather in Croatia.