17.09
thu
thu
Day
86°F
W 9 mph
Precip.
6%
6%
Night
84°F
SW 7 mph
Precip.
18%
18%
18.09
fri
fri
Day
86°F
W 9 mph
Precip.
18%
18%
Night
86°F
SW 7 mph
Precip.
16%
16%
19.09
sat
sat
Day
86°F
NW 7 mph
Precip.
10%
10%
Night
86°F
NW 9 mph
Precip.
5%
5%
20.09
sun
sun
Day
86°F
W 9 mph
Precip.
7%
7%
Night
84°F
NW 12 mph
Precip.
17%
17%
21.09
mon
mon
Day
84°F
W 11 mph
Precip.
43%
43%
Night
82°F
NW 17 mph
Precip.
66%
66%
22.09
tue
tue
Day
79°F
NW 15 mph
Precip.
84%
84%
Night
81°F
W 25 mph
Precip.
84%
84%
23.09
wed
wed
Day
81°F
W 17 mph
Precip.
56%
56%
Night
84°F
W 19 mph
Precip.
57%
57%
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 September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 87.8°F. The highest and lowest sea temperatures during the month were 88.3°F and 87.3°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.
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: 08:17
September 17, thursday
0900
86°F
W
9 mph
9 mph
1200
86°F
W
9 mph
9 mph
1500
86°F
W
7 mph
7 mph
1800
86°F
SW
7 mph
7 mph
2100
86°F
W
9 mph
9 mph
September 18, friday
0000
84°F
SW
7 mph
7 mph
0300
84°F
SW
7 mph
7 mph
0600
84°F
SW
7 mph
7 mph
