Current sea water temperature:
+86.9°F
| Minimum sea water temperature in August: | 88.2°F |
| Maximum sea water temperature in August: | 83.7°F |
| Average sea water temperature in August: | 85.9°F |
| more information | |
14 days
forecast
forecast
| Grand Cayman |
monthly
weather
weather
| Grand Cayman |
Sea water temperature for the last 10 days:
| August 12 | 86.9°F | August 7 | 86.7°F |
| August 11 | 86.9°F | August 6 | 86.5°F |
| August 10 | 86.7°F | August 5 | 86.7°F |
| August 9 | 86.5°F | August 4 | 86.9°F |
| August 8 | 86.7°F | August 3 | 86.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Grand Cayman?
Based on the data about daily sea water temperature for the last three years the warmest sea in Grand Cayman was noticed in September, August and October.
Monthly Sea Temperatures in Grand Cayman, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 87.4°F. The highest and lowest sea temperatures during the month were 87.8°F and 86.9°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 86.9°F. The highest and lowest sea temperatures during the month were 87.4°F and 85.8°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 86.6°F. The highest and lowest sea temperatures during the month were 88.3°F and 85.3°F.
current
weather
weather
| Grand Cayman |
weather in
August
August
| Grand Cayman |
Best time for vacation in Grand Cayman
Grand Cayman on a weather map
Places in Cayman Islands:
Name
°F
24 Hours Forecast
Grand Cayman
Local time: 21:18
August 13, thursday
0000
84°F
SW
13 mph
13 mph
0300
84°F
SW
14 mph
14 mph
0600
84°F
SW
15 mph
15 mph
0900
84°F
W
16 mph
16 mph
1200
84°F
W
14 mph
14 mph
1500
86°F
W
14 mph
14 mph
1800
84°F
W
13 mph
13 mph
2100
84°F
W
12 mph
12 mph
