Koper weather and climate
Koper weather and climate
Day
7 °C
Night
2 °C
Sea
11 °C
Precipitation
69 mm
in month
Rainy days
7 days
in month
Daylight
9 hours
average
Sunshine
3 hours
average
Humidity
70 %
Day
7 °C
Night
2 °C
Sea
11 °C
Precipitation
69 mm
in month
Rainy days
7 days
in month
Daylight
9 hours
average
Sunshine
3 hours
average
Humidity
70 %
Overview: Koper
Travel information
Weather charts for Koper
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.
Find more destinations like this
Activities in Koper
Destinations with similar weather to Koper
Other destinations in Slovenia
Closest cities for Koper
Weather overview for Koper
Weather overview
Koper (Slovenia) in general has a mild climate. The day temperatures range from 7 °C (44 °F) in January to 28 °C (82 °F) in July. Temperatures during the night go from 2 °C (36 °F) in January to 20 °C (67 °F) in July. The driest month is January with just 7 days of rain, on the contrary, the month when it rains the most is June with 11 days of rain. Sea temperatures are in the following range: 10 °C (49 °F) in February to 25 °C (76 °F) in August.
January weather
The minimum of the day temperature can be noticed, its value is 7 °C (44 °F) in Koper, while the sea temperature continues to descent, with its value being 11 °C (51 °F). The minimum of the number of rainy days is observable, with its value being 7 days. The night temperature reaches its minimum, its value is 2 °C (36 °F). The number of sun hours (without clouds) starts to rise in this month. The minimum of the wind speed can be noticed, with its value being 2.
February weather
The day temperature starts to rise, with its value being 8 °C (46 °F) in Koper, while the minimum of the sea temperature can be noticed, the value of this measure is 10 °C (49 °F). The rainfall amount is on its minimum, with its value being 63 mm (2.48 in). The number of sun hours (without clouds) continues to rise, its value is 4 hours.
March weather
The sea temperature starts to rise, with its value being 10 °C (50 °F) in Koper, while the day temperature continues to rise. The beginning of the rise of the rainfall amount could be noticed, with its value being 75 mm (2.96 in). The number of sun hours (without clouds) rises similarly to the previous month, the value of this measure is 5 hours. The maximum of the wind speed is observable, its value is 2. The night temperature starts to rise in this month.
April weather
The sea temperature rises similarly to the previous month, with its value of 13 °C (55 °F) in Koper, and the rise of the day temperature can be observed as well, the value of this measure is 16 °C (61 °F). The rainfall amount rises similarly to the previous month, with its value of 83 mm (3.29 in), while the number of rainy days rise's start could be observed. The night temperature rises similarly to the previous month, with its value being 9 °C (47 °F). The number of sun hours (without clouds) continues to rise, its value is 6 hours.
May weather
The day temperature continues to rise, the value of this measure is 21 °C (70 °F) in Koper, and the sea temperature rises similarly to the previous month as well. The rainfall amount rises similarly to the previous month, its value is 92 mm (3.64 in). The night temperature rises similarly to the previous month, its value is 14 °C (56 °F). The rise of the number of sun hours (without clouds) can be observed.
June weather
The day temperature continues to rise, with its value being 25 °C (77 °F) in Koper, and the sea temperature continues to rise as well, with its value being 22 °C (71 °F). The tourist season slowly starts. The maximum of the number of rainy days is observable in June. The day length reaches its maximum in June. The number of sun hours (without clouds) rises similarly to the previous month, the value of this measure is 8 hours.
July weather
The maximum of the day temperature can be noticed, with its value being 28 °C (82 °F) in Koper, while the rise of the sea temperature can be observed, with its value of 24 °C (76 °F). The tourist season is taking place in July. The beginning of the descent of the number of rainy days could be noticed, with its value of 9 days. The night temperature reaches its maximum in this month. The maximum of the number of sun hours (without clouds) is observable, with its value of 9 hours.
August weather
There is pending tourist season this month in Koper. The sea temperature is on its maximum, the value of this measure is 25 °C (76 °F), while the day temperature descent's start could be observed, with its value of 27 °C (80 °F). The rainfall amount starts to rise, with its value of 99 mm (3.90 in). The beginning of the descent of the number of sun hours (without clouds) could be noticed, its value is 9 hours.
September weather
There is pending tourist season in Koper. The sea temperature descent's start could be observed, with its value of 22 °C (71 °F), while the descent of the day temperature can be observed, with its value of 22 °C (71 °F). The number of rainy days rise's start could be observed, with its value of 10 days, while the rainfall amount rises similarly to the previous month, with its value of 114 mm (4.48 in). The night temperature descent's start could be observed.
October weather
The sea temperature continues to descent, with its value being 19 °C (66 °F) in Koper, and the day temperature continues to descent too, with its value of 17 °C (62 °F). The maximum of the rainfall amount is observable, with its value being 129 mm (5.06 in). The night temperature continues to descent, with its value of 11 °C (52 °F). The number of sun hours (without clouds) continues to descent. The maximum of the humidity is observable, its value is 72 %.
November weather
The descent of the sea temperature can be observed in Koper, and the descent of the day temperature can be observed as well, with its value being 12 °C (53 °F). The night temperature continues to descent, with its value being 7 °C (44 °F). The number of sun hours (without clouds) descents similarly to the previous month, with its value of 3 hours. The rainfall amount descent's start could be observed in November.
December weather
The day temperature continues to descent, with its value being 8 °C (46 °F) in Koper, and the sea temperature descents similarly to the previous month as well, with its value being 13 °C (55 °F). The number of rainy days descent's start could be observed in December. The descent of the night temperature can be observed, the value of this measure is 3 °C (38 °F). The minimum of the day length can be noticed. The minimum of the number of sun hours (without clouds) can be noticed in December.
FAQs
How many sunny hours can I expect in Koper in April?
In Koper in April, you can expect around 6 hours of sunshine.
How many days of precipitation on average can I expect in May in Koper?
There are 11 days, which are rainy in Koper in May, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.5 days of the week, or in general - 35 % days.
Is there a wet season in Koper in June?
No, there is no wet season in June in Koper - you can expect 11 days of rain during the month.
What is the temperature in Koper during the day in July?
In July in Koper, the average daily temperatures will be 28 °C (82 °F). The ideal temperature for enjoying sunbathing by the water and a good temperature for other activities. For some people, it will be too hot in the direct sunlight and the stay may not be so pleasant. Don't forget to pack flip-flops, sunscreen, and a hand fan if necessary - it may come in handy.
Is it hot in Koper in August?
In August in Koper, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
What is the sea temperature in Koper in September?
The temperature of the sea in Koper in September is 22 °C (71 °F). The sea at this temperature is quite cold, but it is already possible to stay in it for a long time and it is pleasantly refreshing on hot, steamy days.
Are there good conditions to visit in Koper in October?
Koper can be visited in October - the weather will be moderate. A relatively low temperature of 17 °C (62 °F) may be ideal for walking or outdoor activities, but some people may have a different idea of the holiday. The temperature of 11 °C (52 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.