Opatija Temperature by Month
The average annual maximum temperature in Opatija, Istria, Croatia is 16°C (61°F), with daytime highs ranging from 7°C (45°F) in January to 27°C (81°F) in August. This page covers monthly averages, day-night differences, and how Opatija compares to cities worldwide.
Opatija Monthly Temperatures
With significant temperature fluctuations, Opatija enjoys distinct seasons year-round. Nighttime lows range from 18°C (64°F) in August to 1°C (34°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Opatija by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. August, the city's warmest month, gets 281 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Opatija Temperatures: 1976-2026
Browse day-by-day temperature records for Opatija spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Opatija vs Croatia
The map below shows the annual temperature across Croatia. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
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Opatija vs World: Temperature Compared
Opatija's average annual maximum temperature is 16°C (61°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Opatija?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Opatija, January is the coolest month, with average highs of 7°C (45°F) and humidity around 66% — considered high. In August, the warmest month, temperatures average 27°C (81°F) with 56% humidity — conditions that feel moderate. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Opatija this rarely lasts long on the ground.
For more on Opatija's weather — including monthly rainfall, sunshine hours, and humidity — visit our Opatija climate page.
