AI-generatedKoper at a glance
- Best time
- Jun – Aug
- Warmest month
- Aug · 27°
- Warmest sea
- Aug · 25.5°
- Sunshine a year
- 2,470 h
- Rain a year
- 1,270 mm
- Climate
- Temperate
- Time zone
- UTC+1 / UTC+2
- Elevation
- 12 m
Climate in Koper
Koper has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 27 °C, while January is the coolest at 8 °C. With around 2,470 hours of sunshine a year, Koper is sunny; July is the sunniest month with 9.7 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: June – August
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 14°
- Midday, 13:00: about 18°
- Afternoon, 16:00: about 18°
- Evening, 20:00: about 16°
- Night, 23:00: about 15°
07:2018:22
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:01–08:00 · evening 17:41–18:40
- Blue hour
- Morning 06:50–07:01 · evening 18:40–18:52
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Koper in October?
In October, Koper is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 19.4 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 145 mm in total. All in all, October is not an ideal month for a holiday in Koper.
More details for October
- Daylight
- 11 h 2 min07:20 – 18:22
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Ljubljana
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %34 %
- Sunshineweight 20 %42 %
- Few rainy daysweight 20 %44 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Koper
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 18.2 – 20.3 °C
Swimming season: Jun – Sep
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Koper ranges from 9.7 °C in February to 25.5 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to September.
From September to February the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 24.3 and 26.9 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 10.9° | 9.9° | 12.0° | cold |
| FebruaryFeb | 9.7° | 8.4° | 10.9° | cold |
| MarchMar | 10.3° | 9.0° | 11.8° | cold |
| AprilApr | 13.3° | 12.3° | 14.7° | cold |
| MayMay | 18.0° | 16.5° | 19.4° | fresh |
| JuneJun | 22.8° | 21.8° | 24.1° | refreshing |
| JulyJul | 25.3° | 24.1° | 26.3° | pleasant |
| AugustAug | 25.5° | 24.3° | 26.9° | pleasant |
| SeptemberSep | 22.9° | 21.8° | 24.3° | refreshing |
| OctoberOct | 19.4° | 18.2° | 20.3° | fresh |
| NovemberNov | 16.3° | 14.9° | 17.5° | cold |
| DecemberDec | 13.2° | 12.1° | 14.2° | cold |
Sunshine hours in Koper
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.5 of 11.0 hours of daylight in Koper, 50 % of the day.
Sunshine hours: measured at the weather station 15 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Koper
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 45 min
- Fair skin
- about 55 min
- Light brown skin
- about 80 min
- Olive skin
- about 100 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Koper: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Koper has about 12 rainy days with 145 mm of rain in total.
Wind and clouds in Koper
How breezy and how cloudy Koper is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Koper typically peaks at 16 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 55 % of the sky over Koper: variable cloud, with about 5.5 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Koper
How often the day gets hot in Koper (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Koper has about 0 hot days, with an average daytime high of 18 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Koper
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- muggy month (10+ muggy days)
CoolOctober: nights around 13°. A duvet at night and a jumper for the evening.
The coolest nights are in January (4°), the warmest in August (21°). Tropical nights of 20 °C and more are the rule from July to August; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in June and in September. Nights fall below 8 °C on average from December to March, so the room should be heated. It is muggy (dew point 18 °C or more) on about 50 days a year, mostly from June to August.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 18 | 8° | 4° | 10.9° | 4.8 h | 10 | 87 |
| FebruaryFeb | 22 | 9° | 4° | 9.7° | 5.8 h | 9 | 86 |
| MarchMar | 24 | 12° | 6° | 10.3° | 6.5 h | 10 | 88 |
| AprilApr | 23 | 15° | 10° | 13.3° | 6.8 h | 11 | 96 |
| MayMay | 34 | 20° | 14° | 18.0° | 8.2 h | 13 | 106 |
| JuneJun | 84 | 25° | 19° | 22.8° | 8.8 h | 9 | 77 |
| JulyJul | 94 | 27° | 21° | 25.3° | 9.7 h | 8 | 69 |
| AugustAug | 93 | 27° | 21° | 25.5° | 9.1 h | 9 | 90 |
| SeptemberSep | 66 | 22° | 17° | 22.9° | 7.1 h | 10 | 152 |
| OctoberOct | 26 | 18° | 13° | 19.4° | 5.5 h | 12 | 145 |
| NovemberNov | 12 | 13° | 9° | 16.3° | 4.3 h | 13 | 164 |
| DecemberDec | 17 | 9° | 5° | 13.2° | 4.6 h | 10 | 110 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
45.55° N, 13.73° E · 12 m · Europe/Ljubljana
Best time to visit Koper
The best time to visit Koper is from June to August. For a beach holiday with the sea above 21 °C, go from June to August. For sightseeing, day trips and hiking, conditions are most comfortable in April and from June to October. Rain is most frequent in May and in November; the wettest month is November with 164 mm.
Koper through the seasons
How the weather changes over the seasons, with averages for each.
Koper in spring
Mar – May
Poor
- 12–20 °C by day
- Sea 14 °C
- 7 h of sun a day
- 33 rainy days in all
Koper in summer
Jun – Aug
Excellent
- 25–27 °C by day
- Sea 25 °C
- 9 h of sun a day
- 26 rainy days in all
Koper in autumn
Sep – Nov
Poor
- 13–22 °C by day
- Sea 20 °C
- 6 h of sun a day
- 35 rainy days in all
Koper in winter
Dec – Feb
Poor
- 8–9 °C by day
- Sea 11 °C
- 5 h of sun a day
- 28 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Koper for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Compare two months in Koper
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Koper: score 94 against 26. In July, days are 9 °C warmer than in October. The sea is 6 °C warmer in July. July has 4 fewer rainy days. The sun shines 4 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Weather score | 26 | 94better |
| Day high | 18° | 27° |
| Night low | 13° | 21° |
| Sea | 19.4° | 25.3° |
| Sunshine | 5.5 h | 9.7 hbetter |
| Rainy days | 12 | 8better |
| Rainfall | 145 mm | 69 mmbetter |
| Muggy days | 0better | 17 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Jun – Aug
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr, Jun – Oct
15–28 °C and not too much rain
Rainy months
May, Nov
12 or more rainy days
Koper month by month
The typical weather for every month at a glance.
18January8° · Sea 11° · 5 h
In January, Koper is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 10.9 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 87 mm in total. All in all, January is not an ideal month for a holiday in Koper.
Koper in January22February9° · Sea 10° · 6 h
In February, Koper is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sea averages 9.7 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain falls on about 9 days, adding up to 86 mm. All in all, February is not an ideal month for a holiday in Koper.
Koper in February24March12° · Sea 10° · 7 h
In March, Koper is cool: daytime highs average 12 °C, and nights cool down to about 6 °C. The sea averages 10.3 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 88 mm in total. All in all, March is not an ideal month for a holiday in Koper.
Koper in March23April15° · Sea 13° · 7 h
In April, Koper is cool: daytime highs average 15 °C, and nights cool down to about 10 °C. The sea averages 13.3 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 96 mm in total. All in all, April is not an ideal month for a holiday in Koper.
Koper in April34May20° · Sea 18° · 8 h
In May, Koper is mild: daytime highs average 20 °C, and nights cool down to about 14 °C. The sea averages 18.0 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 106 mm in total. All in all, May is not an ideal month for a holiday in Koper.
Koper in May84June25° · Sea 23° · 9 h
In June, Koper is warm: daytime highs average 25 °C, and nights cool down to about 19 °C. The sea averages 22.8 °C – refreshing for a swim. The sun shines for around 9 hours a day. Rain is frequent, with about 9 rainy days and 77 mm in total. All in all, June is an excellent month for a holiday in Koper.
Koper in June94July27° · Sea 25° · 10 h
In July, Koper is warm: daytime highs average 27 °C, and even at night it stays warm at around 21 °C. The sea averages 25.3 °C – pleasant for swimming. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 8 days, adding up to 69 mm. The air is often humid and muggy. All in all, July is an excellent month for a holiday in Koper.
Koper in July93August27° · Sea 26° · 9 h
In August, Koper is warm: daytime highs average 27 °C, and even at night it stays warm at around 21 °C. The sea averages 25.5 °C – pleasant for swimming. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 9 days, adding up to 90 mm. The air is often humid and muggy. All in all, August is an excellent month for a holiday in Koper.
Koper in August66September22° · Sea 23° · 7 h
In September, Koper is warm: daytime highs average 22 °C, and nights cool down to about 17 °C. The sea averages 22.9 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 152 mm in total. All in all, September is a good month for a holiday in Koper.
Koper in September26October18° · Sea 19° · 6 h
In October, Koper is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 19.4 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 145 mm in total. All in all, October is not an ideal month for a holiday in Koper.
Koper in October12November13° · Sea 16° · 4 h
In November, Koper is cool: daytime highs average 13 °C, and nights cool down to about 9 °C. The sea averages 16.3 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 164 mm in total. All in all, November is not an ideal month for a holiday in Koper.
Koper in November17December9° · Sea 13° · 5 h
In December, Koper is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 13.2 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 110 mm in total. All in all, December is not an ideal month for a holiday in Koper.
Koper in DecemberKoper compared
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Koper vs. Izola
In October the holiday weather in Koper and Izola is about equally good (score 26 vs. 26). During the day it is about as warm in Izola as in Koper. The sea is about equally warm.
| in October | Koper | Izola |
|---|---|---|
| Holiday score | 26 | 26 |
| Daytime high | 18° | 18° |
| Sea | 19° | 19° |
| Sunshine | 6 h | 6 h |
| Rainy days | 12 | 12 |
| Best time | Jun – Aug | Jun – Aug |
Through the year
Slovenia in October: the best places
In October, Koper ranks 8 of 10 destinations in this country.
- Ptuj16°70
- 2Maribor16°65
- 3Novo Mesto16°64
- 4Celje16°64
- 5Ljubljana15°56
- 6Kranj15°52
- 7Bled14°50
- 8KoperThis page18°19°26
Planning a trip to Koper
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Koper in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Koper has its best school-holiday weather during the summer holidays (score 93) and its weakest during the Christmas holidays (score 18).
- 23
Easter holidays
Mar – Apr
Poor
- 14 °C by day
- Sea 12 °C
- 6.7 h of sun a day
- 11 rainy days a month
- 44
May half-term
May – Jun
Fair
- 21 °C by day
- Sea 19 °C
- 8.3 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
- 93
Summer holidays
Jul – Aug
ExcellentBest holidays
- 27 °C by day
- Sea 25 °C
- 9.3 h of sun a day
- 9 rainy days a month
Good for: Beach & swimming, Sightseeing & walks
- 26
October half-term
Oct
Poor
- 18 °C by day
- Sea 19 °C
- 5.5 h of sun a day
- 12 rainy days a month
Good for: Sightseeing & walks
- 18
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- Sea 12 °C
- 4.7 h of sun a day
- 10 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h
- Distance
- 1,230 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Koper
When is the best time to visit Koper?
The best time to visit Koper is from June to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Koper?
The sea temperature in Koper ranges from 9.7 °C in February to 25.5 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to September.
Can you swim in Koper in October?
Only if you don't mind cold water: in October the sea averages just 19.4 °C. Comfortable swimming is possible from June to September.
What is the warmest month in Koper?
August is the warmest month, with average highs of 27 °C and nights around 21 °C. January is the coolest month at 8 °C.
When does it rain most in Koper?
Rain is most frequent in May and in November; the wettest month is November with 164 mm. The driest month is July with 69 mm.
How many hours of sunshine does Koper get?
Koper gets around 2,470 hours of sunshine a year. The sunniest month is July with 9.7 hours a day; in November there are 4.3 hours a day.
What time zone is Koper in?
Koper uses the time zone Europe/Ljubljana: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Koper?
A nonstop flight from London to Koper takes about 2 h, for a straight-line distance of about 1,230 km.
Which school holidays are best for Koper?
Koper has its best school-holiday weather during the summer holidays (score 93) and its weakest during the Christmas holidays (score 18). Holiday ratings (0–100): Easter holidays 23, May half-term 44, Summer holidays 93, October half-term 26, Christmas holidays 18.
Near Koper
Other destinations close by.
Places with a climate like Koper
Destinations whose weather through the year is closest to Koper's – good alternatives.