World Resorts Cayman Islands Grand Cayman Weather

Grand Cayman Sea Temperature in September

Average sea water temperature in September:
+86.1°F
Minimum sea water temperature in September: 87.8°F
Maximum sea water temperature in September: 83.8°F

Daily 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.

Monthly sea water temperature in Grand Cayman, °F

Which Cayman Islands resorts have warmest sea in September?

Place name September 2025 September 2024
Cayman Brac 87.6°F 87.3°F
Little Cayman 87.5°F 87.4°F
Grand Cayman 87.4°F 86.9°F
George Town 87.4°F 86.9°F

Best time for vacation in Grand Cayman

Sunniest months:
March 11 days
July 11 days
May 10 days
Warmest months:
August 87.1 °F
July 87.0 °F
September 86.9 °F
Warmest sea temp:
September 86.1 °F
August 85.9 °F
October 85.5 °F
Coldest months:
January 80.1 °F
February 80.5 °F
March 80.9 °F
Rainiest months:
October 8 days
May 5 days
November 5 days
Windiest months:
December 16.8 mph
November 16.1 mph
January 15.7 mph

Grand Cayman on a weather map

Current weather
15:40
Grand Cayman
+73°F
S 16 mph
Feels like: +77°F
Precip.: 0%
Places in Cayman Islands:
Name
°F
Grand Cayman
+73°F
George Town
+73°F
Cayman Brac
+73°F
Little Cayman
+73°F
24 Hours Forecast
Grand Cayman
Local time: 15:40
February 07, saturday
1800
73°F
S
19 mph
2100
73°F
S
16 mph
February 08, sunday
0000
73°F
SW
13 mph
0300
73°F
SW
11 mph
0600
73°F
SW
11 mph
0900
73°F
SW
15 mph
1200
73°F
SW
17 mph
1500
73°F
SW
17 mph
Units of measurement: °C / °F