28.08
fri
fri
Day
86°F
SW 14 mph
Precip.
7%
7%
Night
84°F
W 8 mph
Precip.
29%
29%
29.08
sat
sat
Day
86°F
W 11 mph
Precip.
17%
17%
Night
84°F
W 4 mph
Precip.
9%
9%
30.08
sun
sun
Day
86°F
W 9 mph
Precip.
19%
19%
Night
84°F
SW 5 mph
Precip.
19%
19%
31.08
mon
mon
Day
86°F
SW 7 mph
Precip.
21%
21%
Night
84°F
W 14 mph
Precip.
24%
24%
01.09
tue
tue
Day
84°F
W 12 mph
Precip.
8%
8%
Night
84°F
NW 5 mph
Precip.
13%
13%
02.09
wed
wed
Day
86°F
W 8 mph
Precip.
6%
6%
Night
84°F
NW 9 mph
Precip.
36%
36%
03.09
thu
thu
Day
84°F
NW 9 mph
Precip.
34%
34%
Night
84°F
W 9 mph
Precip.
7%
7%
sea water
temperature
temperature
| Grand Cayman |
monthly
weather
weather
| Grand Cayman |
current
weather
weather
| Grand Cayman |
14 days
forecast
forecast
| Grand Cayman |
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 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.
Air temperature in Grand Cayman, °F
Precipitation total in Grand Cayman, in.
* Charts above show average data for the last 3 years.
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: 06:11
August 28, friday
0900
84°F
SW
14 mph
14 mph
1200
86°F
SW
14 mph
14 mph
1500
86°F
SW
14 mph
14 mph
1800
86°F
W
12 mph
12 mph
2100
84°F
W
9 mph
9 mph
August 29, saturday
0000
84°F
W
8 mph
8 mph
0300
84°F
SW
10 mph
10 mph
0600
86°F
SW
10 mph
10 mph
