Current sea water temperature:
+82.6°F
| Minimum sea water temperature in December: | 84.7°F |
| Maximum sea water temperature in December: | 80.6°F |
| Average sea water temperature in December: | 82.4°F |
| more information | |
14 days
forecast
forecast
| Grand Cayman |
monthly
weather
weather
| Grand Cayman |
Sea water temperature for the last 10 days:
| December 23 | 82.6°F | December 18 | 82.9°F |
| December 22 | 82.8°F | December 17 | 83.3°F |
| December 21 | 82.8°F | December 16 | 83.1°F |
| December 20 | 83.1°F | December 15 | 83.3°F |
| December 19 | 82.9°F | December 14 | 83.5°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
December
December
| 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: 18:10
December 23, tuesday
2100
82°F
W
22 mph
22 mph
December 24, wednesday
0000
81°F
W
21 mph
21 mph
0300
81°F
SW
24 mph
24 mph
0600
81°F
W
24 mph
24 mph
0900
81°F
SW
25 mph
25 mph
1200
81°F
SW
25 mph
25 mph
1500
81°F
SW
24 mph
24 mph
1800
81°F
SW
24 mph
24 mph
