Koper Weather in August
August in Koper brings high temperatures, with daytime highs of 28°C (82°F) and nights around 20°C (68°F). Quite a bit of rainfall is expected, around 96 mm (3.8 in), so pack an umbrella.
Rainfall in Koper in August
Historically, the month has about 12 days of rain, averaging 96 mm (3.8 in) in total. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Koper in August
August is a perfect month in Koper, with 28°C (82°F) during the day and 20°C (68°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights remain mild at 20°C (68°F), making evenings a pleasant time to be outdoors. This is typically the warmest month of the year, so light summer clothing is a good idea.
Sunshine in Koper in August
With approximately 299 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Koper's climate page.
Koper Temperature in August
Min Temperature
20°C (68°F)
Max Temperature
28°C (82°F)
Chance of Rain
39%
Precipitation
96 mm (3.8 in)
Rainy days
12 days
Humidity
51% *
Sunshine
299 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koper typically stay consistent throughout August, with daily highs averaging around 28°C (82°F). Nights are pleasant, with lows typically ranging from 16°C (61°F) to 19°C (66°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Koper in August
Browse day-by-day weather records for Koper spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Koper historical weather extremes in August
The extremes listed below come from historical weather data collected in Koper from 1976 through 2025.
- The hottest August day on record in Koper reached 38°C (100°F) (August 14, 2025).
- On August 30, 2023, Koper saw its coldest August day with temperatures maxing out at 19°C (66°F).
- Koper registered its coldest August night on August 31, 2010, with temperatures dropping to 8°C (46°F).
Best Places in Slovenia in August
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in August →
perfect weather
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unpleasant
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What to Wear in Koper in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Koper in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Koper's climate page.
Temperature Rainfall Sunshine Humidity
See the full Koper climate overview or explore weather in Slovenia.
