16.09
wed
wed
Day
72°F
NE 4 mph
Precip.
2%
2%
Night
66°F
SW 4 mph
Precip.
6%
6%
17.09
thu
thu
Day
68°F
NE 2 mph
Precip.
50%
50%
Night
63°F
SW 7 mph
Precip.
36%
36%
18.09
fri
fri
Day
66°F
NE 2 mph
Precip.
76%
76%
Night
63°F
SW 7 mph
Precip.
69%
69%
19.09
sat
sat
Day
68°F
SW 7 mph
Precip.
16%
16%
Night
63°F
SW 7 mph
Precip.
8%
8%
20.09
sun
sun
Day
75°F
S 2 mph
Precip.
6%
6%
Night
66°F
SW 8 mph
Precip.
14%
14%
21.09
mon
mon
Day
73°F
W 2 mph
Precip.
7%
7%
Night
63°F
SW 14 mph
Precip.
15%
15%
22.09
tue
tue
Day
66°F
SW 6 mph
Precip.
3%
3%
Night
61°F
SW 8 mph
Precip.
4%
4%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 77.0°F. The highest and lowest sea temperatures during the month were 78.8°F and 74.5°F.
Air temperature in Rijeka, °F
Precipitation total in Rijeka, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Rijeka
Rijeka on a weather map
Places in Croatia:
Name
°F
24 Hours Forecast
Rijeka
Local time: 14:58
September 16, wednesday
1500
70°F
E
3 mph
3 mph
1800
68°F
SE
1 mph
1 mph
2100
68°F
SW
4 mph
4 mph
September 17, thursday
0000
66°F
SW
4 mph
4 mph
0300
66°F
SW
6 mph
6 mph
0600
66°F
SW
5 mph
5 mph
0900
68°F
SW
2 mph
2 mph
1200
68°F
NE
2 mph
2 mph
