Average sea water temperature in September:
+85.8°F
| Minimum sea water temperature in September: | 89.2°F |
| Maximum sea water temperature in September: | 81.7°F |
Daily sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 85.7°F. The highest and lowest sea temperatures during the month were 87.3°F and 84.0°F.
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| Cat Ba Island |
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| Cat Ba Island |
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| Cat Ba Island |
Monthly sea water temperature in Cat Ba Island, °F
Which Vietnam resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Thanh Hoa | 86.0°F | 85.8°F |
| Hue | 85.8°F | 86.4°F |
| Cat Ba Island | 85.7°F | 86.0°F |
| Ha Long | 85.6°F | 85.9°F |
| Doc Let Beach | 85.4°F | 85.5°F |
| Tuan Chau | 85.3°F | 85.7°F |
| Nha Trang | 85.2°F | 85.1°F |
| Da Nang | 85.1°F | 86.2°F |
| Vinpearl | 85.0°F | 85.0°F |
| Hoi An | 85.0°F | 85.8°F |
| Cam Ranh | 84.9°F | 84.9°F |
| Hai Phong | 84.5°F | 84.9°F |
| Phan Rang | 84.0°F | 83.8°F |
| Phu Quoc | 84.0°F | 84.8°F |
| Con Dao | 84.0°F | 84.7°F |
| Ho Chi Minh | 83.8°F | 84.1°F |
| Vung Tau | 83.6°F | 84.2°F |
| Ke Ga | 82.4°F | 82.7°F |
| Mui Ne | 82.1°F | 82.4°F |
| Phan Thiet | 82.1°F | 82.4°F |
Best time for vacation in Cat Ba Island
Cat Ba Island on a weather map
Places in Vietnam:
Name
°F
24 Hours Forecast
Cat Ba Island
Local time: 16:12
December 05, friday
1800
68°F
W
12 mph
12 mph
2100
68°F
SW
8 mph
8 mph
December 06, saturday
0000
66°F
SW
6 mph
6 mph
0300
66°F
SW
7 mph
7 mph
0600
66°F
SW
8 mph
8 mph
0900
68°F
W
11 mph
11 mph
1200
70°F
W
11 mph
11 mph
1500
70°F
W
9 mph
9 mph
