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    Slovenia

    Koper weather and climate

    Slovenia

    Koper weather and climate

    Day

    21 °C

    Night

    14 °C

    Sea

    18 °C

    Precipitation

    92 mm

    in month

    Rainy days

    11 days

    in month

    Daylight

    15 hours

    average

    Sunshine

    7 hours

    average

    Humidity

    67 %

    Weather charts for Koper

    JanFebMarAprMayJunJulAugSepOctNovDecTemperature (° C)051015202530Precipitation (mm)0140
    Weather overview
    JanFebMarAprMayJunJulAugSepOctNovDecTemperature (° C)051015202530Precipitation (mm)0140
    Wet days chart
    JanFebMarAprMayJunJulAugSepOctNovDecWet days468101214468101214
    Sunhours per day chart
    JanFebMarAprMayJunJulAugSepOctNovDecSunhours per day02468101224681012
    Wind chart
    JanFebMarAprMayJunJulAugSepOctNovDecWind0246123456
    Humidity chart
    JanFebMarAprMayJunJulAugSepOctNovDecHumidity %60657075806065707580
    Data backed by 40 years of history

    We make the most from 40 years of historical weather data to predict the best weather conditions.

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    16 500 000 weather records

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    Architecture in Koper on a sunny day with some clouds

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    Weather overview for Koper

    Weather overview

    Koper (Slovenia) in general has a mild climate. The day temperatures range from 6.7 °C (44.1 °F) in January to 27.6 °C (81.7 °F) in July. Temperatures during the night go from 2.0 °C (35.6 °F) in January to 19.5 °C (67.1 °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: 9.5 °C (49.1 °F) in February to 24.6 °C (76.3 °F) in August.

    January weather

    The minimum of the day temperature can be noticed, its value is 6.7 °C (44.1 °F) in Koper, while the sea temperature continues to descent, with its value being 10.6 °C (51.0 °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 2.0 °C (35.6 °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 2.1.

    February weather

    The day temperature starts to rise, with its value being 8.0 °C (46.4 °F) in Koper, while the minimum of the sea temperature can be noticed, the value of this measure is 9.5 °C (49.1 °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 10.0 °C (50.1 °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 2.4. The night temperature starts to rise in this month.

    April weather

    The sea temperature rises similarly to the previous month, with its value of 12.7 °C (54.8 °F) in Koper, and the rise of the day temperature can be observed as well, the value of this measure is 16.0 °C (60.8 °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 8.5 °C (47.3 °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 21.3 °C (70.3 °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 13.5 °C (56.3 °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 25.0 °C (77.0 °F) in Koper, and the sea temperature continues to rise as well, with its value being 21.6 °C (70.8 °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 27.6 °C (81.7 °F) in Koper, while the rise of the sea temperature can be observed, with its value of 24.2 °C (75.6 °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 24.6 °C (76.3 °F), while the day temperature descent's start could be observed, with its value of 26.8 °C (80.2 °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 21.9 °C (71.4 °F), while the descent of the day temperature can be observed, with its value of 21.9 °C (71.4 °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 18.9 °C (66.0 °F) in Koper, and the day temperature continues to descent too, with its value of 16.9 °C (62.4 °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 11.3 °C (52.3 °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 11.8 °C (53.2 °F). The night temperature continues to descent, with its value being 6.5 °C (43.7 °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 7.8 °C (46.0 °F) in Koper, and the sea temperature descents similarly to the previous month as well, with its value being 12.8 °C (55.1 °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 3.2 °C (37.8 °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 27.6 °C (81.7 °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 21.9 °C (71.4 °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 16.9 °C (62.4 °F) may be ideal for walking or outdoor activities, but some people may have a different idea of the holiday. The temperature of 11.3 °C (52.3 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.