Koper
Elevation 3 m45.55° N, 13.73° E
When to go?
Mean 6 °C, 9 rain days in the month (83 mm).
Nothing against it.
Mean 7 °C, 8 rain days in the month (80 mm).
Nothing against it.
Mean 10 °C, 8 rain days in the month (80 mm).
Nothing against it.
Mean 13 °C, 10 rain days in the month (90 mm).
Nothing against it.
Mean 18 °C, 11 rain days in the month (107 mm).
Nothing against it.
Mean 22 °C, 9 rain days in the month (84 mm).
Good for
- Ideal to visitTemperature and rain in the ideal range.
- Ideal for the seawater at 23 °C
Mean 24 °C, 8 rain days in the month (77 mm).
Good for
- Ideal to visitTemperature and rain in the ideal range.
- Ideal for the seawater at 25 °C
Mean 24 °C, 8 rain days in the month (94 mm).
Good for
- Ideal to visitTemperature and rain in the ideal range.
- Ideal for the seawater at 25 °C
Mean 20 °C, 9 rain days in the month (143 mm).
Good for
- Ideal to visitTemperature and rain in the ideal range.
- Ideal for the seawater at 23 °C
Mean 15 °C, 12 rain days in the month (137 mm).
Nothing against it.
Mean 11 °C, 12 rain days in the month (158 mm).
Nothing against it.
Mean 7 °C, 9 rain days in the month (107 mm).
Nothing against it.
The best months are June–September. Ideal for the sea: June–September.
What is the climate like?
Temperature and rain
Monthly min and max temperature (°C)
Monthly min and max temperature (°C)
Temperatures brought to the town's elevation: +1.0 °C (cells at 154 m).
How much it rains
Rain days and how much water
Rain days and how much water
Bars: length = rain days, thickness = mm on a rain day, area = the month's rain. 3 mm a day7 mm a day15 mm a day
Colour = the month's rain: 103060100160250400mm
Daylight hours
Daylight and sky: sunrise, sunset and cloud cover
daylight under a clear sky (average share)daylight under cloud
daylight under a clear sky (average share)daylight under cloud
Times on the 15th of each month, in local time: daylight saving where and when it applies, standard time in the other months.
Sea temperature: Adriatic Sea
Monthly mean sea temperature: Adriatic Sea (°C)
Monthly mean sea temperature: Adriatic Sea (°C)
Effect of climate change
Today's climate (1996–2025) compared with 1961–1990:
In short
Year by year
Temperature of each year
Against 1961–1990 the mean temperature of today (1996–2025) has changed by +1.2 °C; in the last ten years by +1.9 °C. Warmest year: 2024 (+2.7 °C), coldest: 1956 (−1.0 °C).
June and August warmed the most (+2.2 and +2.0 °C), September the least (+0.6 °C). The warm season (above the annual mean of then, 14 °C) begins 8 days earlier and ends 7 days later.
Warming stripes: after an idea by Ed Hawkins (University of Reading), showyourstripes.info, CC BY 4.0.
Rain of each year (% against 1961–1990)
more rain than in 1961–1990less rain
Rain in a year: no clear trend, dry and wet years alternate as before.
The sea, then and now
+0.3 °Cthe sea today, compared with 1961–1990