Weather in Koper in May

General weather information about Koper

Average annual temperature is 13.0 °C

Absolute maximum temperature: 34.2 °C

Absolute minimum temperature: -4.9 °C

Number of sunny days: 152 days

Number of rainy days: 209 days

Number of snow days: 4 days

Look at detailed online map of Koper

* Weather data for Koper Slovenia is based on climate observations for 2026 year

Koper air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)11.614.816.820.324.830.334.233.328.124.516.615.9
Average daytime temperature (°C)7.79.012.814.220.224.827.627.224.220.012.210.1
Average temperature (°C)4.73.88.39.515.720.022.521.819.115.68.46.1
Average night temperature (°C)2.30.04.24.711.715.217.516.914.811.74.92.5
Absolute minimum temperature (°C)-3.9-4.3-1.7-0.37.812.211.611.111.74.4-3.4-4.9

Koper monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.210.411.913.514.915.615.314.112.510.99.58.8
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)4.57.28.29.010.512.712.511.010.57.75.84.8
Precipitation (mm)11635857912710615931489297208109
Sunny days1120131281111161914611
Rainy days17718182319201511172420
Snow days310000000000

Koper - weather forecast by months

Koper weather in januaryKoper weather in februaryKoper weather in marchKoper weather in aprilKoper weather in mayKoper weather in juneKoper weather in julyKoper weather in augustKoper weather in septemberKoper weather in octoberKoper weather in novemberKoper weather in december

Best time to visit Koper:

The best time to visit Koper during the most sunny months:

  • June — 12.7(h)
  • July — 12.5(h)
  • August — 11.0(h)

Months with the longest average daylight duration in Koper:

  • June — 15.6(h)
  • July — 15.3(h)

The largest precipitation sum in Koper is at

  • August — 314(mm)
  • October — 297(mm)
  • November — 208(mm)

    • Weather forecast in the closest to Koper admin centers

    Weather forecast in the closest towns to Koper

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    Frequently asked questions

    When is the best time to visit Koper?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Koper.
    What is the weather like in Koper?
    See average temperature, rainfall and daylight hours for Koper by month in the table above.
    How many sunny days does Koper have?
    The monthly weather statistics above show sunshine and rainfall patterns for Koper throughout the year.