Opatija climate — normals and trends
Opatija (Croatia) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.4 °C and it receives 1,979 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (21.7 °C on average) and the coldest is January (3.2 °C). Rainfall peaks in November.
Opatija averages 28 frost days, 2 hot days (≥ 30 °C) and 145 rainy days per year.
Opatija has warmed by +2.2 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 44 to 12 per year over the period.
The hottest day of the period reached 35.0 °C (on 27 June 2019) and the coldest -17.9 °C (on 23 January 1942).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
OpatijaPrimorje-Gorski Kotar County
- coords
- 45.34°, 14.31°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.4°C
Average daily high
15.1°C
Average daily low
9.9°C
Annual rainfall
1,979mm
Sunshine / day
9.2h
Mean relative humidity
77%
Average peak wind
15.6km/h
Seasonal range
18.5°C
Frost days (< 0 °C)
28 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
39.0 cm
Average feels-like high
13.9 °C
Average feels-like low
7.9 °C
Average peak gust
33.5 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
13.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.56 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
35.0 °C
27 June 2019
Coldest day
-17.9 °C
23 January 1942
Wettest day
128 mm
18 August 1968
Windiest day
50.8 km/h
2 December 1983
Strongest gust
115.9 km/h
4 November 1966
Hottest feels-like
37.5 °C
3 August 2017
Coldest feels-like
-23.9 °C
23 January 1942
Snowiest day
29.0 cm
19 November 1999
Sunniest day
14.8 h
1 July 2019
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 8.7 °C | +3.1 °C | 255 mm | +110 mm |
| Feb | 8.3 °C | +1.4 °C | 116 mm | -31 mm |
| Mar | 12.2 °C | +2.1 °C | 289 mm | +139 mm |
| Apr | 16.0 °C | +2.2 °C | 126 mm | -19 mm |
| May | 18.5 °C | +0.3 °C | 182 mm | +41 mm |
| Jun | 26.3 °C | +4.2 °C | 10 mm | -122 mm |
| Jul | 25.9 °C | +1.2 °C | 165 mm | +61 mm |
| Aug | 25.9 °C | +1.3 °C | 136 mm | +6 mm |
| Sep | 22.0 °C | +1.2 °C | 187 mm | -16 mm |
| Oct | 16.2 °C | +0.2 °C | 319 mm | +83 mm |
| Nov | 12.3 °C | +1.5 °C | 292 mm | +33 mm |
| Dec | 9.8 °C | +2.8 °C | 35 mm | -152 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Opatija?
Opatija has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.4 °C and it receives 1,979 mm of precipitation per year.
What is the hottest day ever recorded in Opatija?
The hottest day measured in Opatija between 1940 and 2025 was 27 June 2019, reaching 35.0 °C.
What is the coldest day in Opatija?
The coldest day measured in Opatija between 1940 and 2025 was 23 January 1942, at -17.9 °C.
Does it snow in Opatija?
Yes. Opatija gets on average 39.0 cm of snow per year and has around 28 frost days.
Has the climate of Opatija warmed?
Yes: Opatija warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Opatija?
The wettest day measured in Opatija between 1940 and 2025 was 18 August 1968, with 128 mm of rain in 24 hours.
What was the windiest day in Opatija?
The windiest day measured in Opatija between 1940 and 2025 was 2 December 1983, with winds reaching 50.8 km/h.
What is the warmest month in Opatija?
The warmest month in Opatija is July (21.7 °C on average); the coldest is January (3.2 °C).
How much does it rain in Opatija?
Opatija receives on average 1,979 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Opatija?
Opatija gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.
What is the biggest single-day snowfall in Opatija?
The heaviest 24-hour snowfall measured in Opatija between 1940 and 2025 was 19 November 1999, with 29.0 cm.
Are there tropical nights in Opatija?
Yes: Opatija has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Opatija?
In Opatija, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 3 August 2017, and the lowest was -23.9 °C on 23 January 1942.
Compare Opatija with another city
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Nearby cities
The climate around Opatija