Measurements:
°C
°F
CURRENT WEATHER
16:32
Grand Cayman
90°F
W 14 mph
Feels like: 102°F
Precip: 7%
World Resorts Cayman Islands Grand Cayman Weather

7 Day Weather Forecast

09.08
tue
DAY
90°F
W 14 mph
precip
17%
NIGHT
90°F
W 13 mph
precip
20%
09.09
wed
DAY
90°F
W 13 mph
precip
44%
NIGHT
90°F
SW 6 mph
precip
19%
09.10
thu
DAY
90°F
N 8 mph
precip
18%
NIGHT
88°F
W 2 mph
precip
14%
09.11
fri
DAY
88°F
W 9 mph
precip
6%
NIGHT
90°F
W 8 mph
precip
5%
09.12
sat
DAY
90°F
NW 16 mph
precip
18%
NIGHT
90°F
NW 15 mph
precip
16%
09.13
sun
DAY
90°F
NW 19 mph
precip
11%
NIGHT
90°F
W 16 mph
precip
26%
09.14
mon
DAY
90°F
W 16 mph
precip
26%
NIGHT
90°F
W 15 mph
precip
28%

Grand Cayman Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Grand Cayman was 30.8°F. The maximum and minimum values were 30.5°F and 31.0°F respectively.

Grand Cayman on the Weather Map

Best Time to Visit Grand Cayman
The most sunny months:
July 10 days
March 10 days
September 10 days
The most warm months:
August 91.1 °F
September 91.0 °F
July 90.9 °F
Warmest sea temperature:
September 90.1 °F
August 89.9 °F
October 89.5 °F
The most cold months:
January 83.4 °F
February 83.6 °F
March 84.3 °F
The most rainy months:
October 8 days
May 5 days
November 5 days
The most windy months:
December 16 mph
November 16 mph
January 16 mph
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