Koper Weather in April
In Koper, April brings moderate daytime temperatures around 17°C (63°F), with nights cooling to 9°C (48°F). Expect quite a bit of rainfall this month.
Rainfall in Koper in April
This month experiences about 13 days of rain according to historical data, averaging 104 mm (4.1 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Koper in April
April in Koper sees highs of 17°C (63°F) and lows of 9°C (48°F) overnight. Conditions are often most pleasant around the middle of the day. With lows around 9°C (48°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Koper in April
The city usually sees around 197 hours of sunlight, indicating many sunny days — a great month for sightseeing.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Koper.
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 April
Min Temperature
9°C (48°F)
Max Temperature
17°C (63°F)
Chance of Rain
45%
Precipitation
104 mm (4.1 in)
Rainy days
13 days
Humidity
55% *
Sunshine
197 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koper typically stay consistent throughout April, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 7°C (45°F) to 10°C (50°F).
Average temperatures in April
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 April
Historical weather for Koper in April
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 April
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Koper.
- The hottest April day on record in Koper reached 28°C (82°F) (April 28, 2012).
- Koper experienced its chilliest April day on April 18, 1991, reaching only 6°C (43°F).
- The lowest overnight temperature recorded in April was -5°C (23°F) (April 8, 2003).
Best Places in Slovenia in April
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in April →
perfect weather
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unpleasant
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What to Wear in Koper in April
Comfortable temperatures call for an easy wardrobe in April. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Koper in April
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.
