Current sea water temperature:
+77.7°F
| Minimum sea water temperature in December: | 79.5°F |
| Maximum sea water temperature in December: | 75.4°F |
| Average sea water temperature in December: | 77.6°F |
| more information | |
14 days
forecast
forecast
| Kauai |
monthly
weather
weather
| Kauai |
Sea water temperature for the last 10 days:
| December 21 | 77.7°F | December 16 | 77.9°F |
| December 20 | 77.7°F | December 15 | 78.1°F |
| December 19 | 77.7°F | December 14 | 78.3°F |
| December 18 | 77.9°F | December 13 | 78.3°F |
| December 17 | 77.7°F | December 12 | 78.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Kauai?
Based on the data about daily sea water temperature for the last three years the warmest sea in Kauai was noticed in September, October and August.
Monthly Sea Temperatures in Kauai, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 81.5°F. The highest and lowest sea temperatures during the month were 81.9°F and 81.1°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 81.3°F. The highest and lowest sea temperatures during the month were 81.9°F and 80.4°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 79.1°F. The highest and lowest sea temperatures during the month were 81.3°F and 76.1°F.
current
weather
weather
| Kauai |
weather in
December
December
| Kauai |
Best time for vacation in Kauai
Kauai on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Kauai
Local time: 08:02
December 21, sunday
0900
75°F
W
9 mph
9 mph
1200
77°F
W
11 mph
11 mph
1500
77°F
W
12 mph
12 mph
1800
73°F
W
11 mph
11 mph
2100
73°F
W
12 mph
12 mph
December 22, monday
0000
73°F
W
12 mph
12 mph
0300
72°F
W
12 mph
12 mph
0600
72°F
W
12 mph
12 mph
