Current sea water temperature:
+84.6°F
| Minimum sea water temperature in May: | 86.4°F |
| Maximum sea water temperature in May: | 80.8°F |
| Average sea water temperature in May: | 83.2°F |
| more information | |
14 days
forecast
forecast
| Grand Cayman |
monthly
weather
weather
| Grand Cayman |
Sea water temperature for the last 10 days:
| May 22 | 84.6°F | May 17 | 84.7°F |
| May 21 | 84.4°F | May 16 | 84.6°F |
| May 20 | 84.6°F | May 15 | 84.0°F |
| May 19 | 84.7°F | May 14 | 83.8°F |
| May 18 | 84.6°F | May 13 | 84.2°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
May
May
| 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: 14:15
May 22, friday
1500
82°F
NW
11 mph
11 mph
1800
82°F
NW
11 mph
11 mph
2100
82°F
W
11 mph
11 mph
May 23, saturday
0000
82°F
W
12 mph
12 mph
0300
82°F
W
11 mph
11 mph
0600
82°F
W
11 mph
11 mph
0900
82°F
W
12 mph
12 mph
1200
82°F
W
15 mph
15 mph
