14.09
mon
mon
Day
73°F
SE 2 mph
Precip.
10%
10%
Night
66°F
SW 9 mph
Precip.
6%
6%
15.09
tue
tue
Day
73°F
E 2 mph
Precip.
2%
2%
Night
68°F
SW 7 mph
Precip.
5%
5%
16.09
wed
wed
Day
72°F
NE 3 mph
Precip.
2%
2%
Night
66°F
SW 4 mph
Precip.
9%
9%
17.09
thu
thu
Day
70°F
N 11 mph
Precip.
65%
65%
Night
63°F
W 5 mph
Precip.
88%
88%
18.09
fri
fri
Day
64°F
SW 6 mph
Precip.
54%
54%
Night
61°F
SW 7 mph
Precip.
18%
18%
19.09
sat
sat
Day
70°F
W 4 mph
Precip.
11%
11%
Night
66°F
SW 6 mph
Precip.
11%
11%
20.09
sun
sun
Day
73°F
W 2 mph
Precip.
3%
3%
Night
68°F
SW 8 mph
Precip.
7%
7%
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 72.4°F. The highest and lowest sea temperatures during the month were 73.6°F and 70.9°F.
Air temperature in Opatija, °F
Precipitation total in Opatija, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Opatija
Opatija on a weather map
Places in Croatia:
Name
°F
24 Hours Forecast
Opatija
Local time: 13:42
September 14, monday
1500
75°F
SE
2 mph
2 mph
1800
73°F
SW
6 mph
6 mph
2100
68°F
SW
8 mph
8 mph
September 15, tuesday
0000
66°F
SW
9 mph
9 mph
0300
63°F
SW
8 mph
8 mph
0600
63°F
SW
7 mph
7 mph
0900
66°F
SW
6 mph
6 mph
1200
73°F
E
2 mph
2 mph
