27.04
mon
mon
Day
73°F
SW 1 mph
Precip.
0%
0%
Night
55°F
W 4 mph
Precip.
0%
0%
28.04
tue
tue
Day
73°F
E 3 mph
Precip.
0%
0%
Night
54°F
W 5 mph
Precip.
0%
0%
29.04
wed
wed
Day
59°F
W 9 mph
Precip.
100%
100%
Night
50°F
W 21 mph
Precip.
0%
0%
30.04
thu
thu
Day
59°F
SW 14 mph
Precip.
0%
0%
Night
43°F
SW 7 mph
Precip.
0%
0%
01.05
fri
fri
Day
64°F
S 8 mph
Precip.
0%
0%
Night
48°F
W 4 mph
Precip.
0%
0%
02.05
sat
sat
Day
68°F
E 6 mph
Precip.
0%
0%
Night
50°F
W 4 mph
Precip.
0%
0%
03.05
sun
sun
Day
68°F
E 6 mph
Precip.
0%
0%
Night
52°F
W 4 mph
Precip.
0%
0%
Sea water temperature in April, °F
Show year:
2026
2025
2024
The average sea water temperature in April of 2026 was 55.8°F. The highest and lowest sea temperatures during the month were 59.5°F and 52.0°F.
Sea water temperature in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 64.9°F. The highest and lowest sea temperatures during the month were 69.1°F and 60.3°F.
Air temperature in Koper, °F
Precipitation total in Koper, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 23:40
April 28, tuesday
0000
55°F
W
4 mph
4 mph
0300
54°F
W
5 mph
5 mph
0600
52°F
W
5 mph
5 mph
0900
64°F
SW
3 mph
3 mph
1200
73°F
E
3 mph
3 mph
1500
72°F
E
7 mph
7 mph
1800
64°F
SE
2 mph
2 mph
2100
55°F
W
4 mph
4 mph
