Koper Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to chilly in Koper. Average maximum daytime temperatures range from a comfortable 28°C (82°F) in August, the warmest time of the year, to a chilly 9°C (48°F) during cooler months like January.

At night, you can expect temperatures ranging from 20°C (68°F) in August to around 3°C (37°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Koper has a relatively rain/snowy climate with high precipitation levels, averaging 1371 mm (54 in) of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, November it receives heavy rainfall, averaging 178 mm (7 in) of precipitation, recorded across 13 rainy days. In contrast, the driest month July brings less rainfall, with 68 mm (2.7 in) over 11 rainy days. For more details, please visit our Koper Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Koper. While July receives considerable daily sunshine with up to 10.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is moderate throughout the year in Koper.

The city experiences its highest humidity in January, reaching 67%. In July, the humidity drops to its lowest level at 50%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year