World Resorts USA Kauai Weather

Kauai sea water temperature

Current sea water temperature:
+76.6°F
Minimum sea water temperature in February: 77.2°F
Maximum sea water temperature in February: 73.8°F
Average sea water temperature in February: 75.6°F

Sea water temperature for the last 10 days:

February 4 76.6°F January 30 77.0°F
February 3 76.8°F January 29 77.2°F
February 2 77.0°F January 28 77.0°F
February 1 77.0°F January 27 76.5°F
January 31 77.2°F January 26 76.5°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.

Best time for vacation in Kauai

Sunniest months:
January 6 days
December 5 days
February 4 days
Warmest months:
September 80.3 °F
August 80.0 °F
July 79.2 °F
Warmest sea temp:
September 80.6 °F
October 80.4 °F
August 79.6 °F
Coldest months:
February 73.9 °F
March 74.2 °F
January 74.6 °F
Rainiest months:
March 2 days
January 2 days
November 1 day
Windiest months:
July 11.7 mph
June 10.9 mph
May 10.8 mph

Kauai on a weather map

Kauai
+70°F
N 5 mph
Feels like: +70°F
Precip.: 0%
Places in USA:
Name
°F
+36°F
+72°F
+72°F
+73°F
+84°F
+72°F
+68°F
+68°F
+32°F
+84°F
+63°F
+68°F
+70°F
+55°F
+23°F
24 Hours Forecast
Kauai
Local time: 08:54
February 04, wednesday
0900
70°F
N
5 mph
1200
75°F
W
4 mph
1500
73°F
SW
2 mph
1800
70°F
SW
1 mph
2100
66°F
NE
2 mph
February 05, thursday
0000
64°F
N
4 mph
0300
64°F
NE
3 mph
0600
63°F
N
5 mph
Units of measurement: °C / °F