Current sea water temperature:
+87.1°F
| Minimum sea water temperature in September: | 88.3°F |
| Maximum sea water temperature in September: | 83.8°F |
| Average sea water temperature in September: | 86.1°F |
| more information | |
14 days
forecast
forecast
| Grand Cayman |
monthly
weather
weather
| Grand Cayman |
Sea water temperature for the last 10 days:
| September 22 | 87.1°F | September 17 | 87.8°F |
| September 21 | 87.1°F | September 16 | 87.8°F |
| September 20 | 87.4°F | September 15 | 88.2°F |
| September 19 | 87.6°F | September 14 | 88.2°F |
| September 18 | 87.8°F | September 13 | 88.0°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 87.7°F. The highest and lowest sea temperatures during the month were 88.3°F and 87.1°F.
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 86.7°F. The highest and lowest sea temperatures during the month were 87.3°F and 86.2°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
September
September
| 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: 00:23
September 23, wednesday
0300
82°F
NW
26 mph
26 mph
0600
82°F
NW
22 mph
22 mph
0900
84°F
NW
17 mph
17 mph
1200
84°F
N
16 mph
16 mph
1500
84°F
NW
11 mph
11 mph
1800
82°F
NW
6 mph
6 mph
2100
82°F
SW
11 mph
11 mph
September 24, thursday
0000
82°F
W
12 mph
12 mph
