Measurements:
°C
°F
CURRENT WEATHER
18:18
Grand Cayman
88°F
NW 13 mph
Feels like: 98°F
Precip: 26%
World Resorts Cayman Islands Grand Cayman Weather

7 Day Weather Forecast

09.28
mon
DAY
88°F
NW 14 mph
precip
20%
NIGHT
88°F
W 15 mph
precip
22%
09.29
tue
DAY
88°F
W 17 mph
precip
17%
NIGHT
88°F
W 12 mph
precip
50%
09.30
wed
DAY
86°F
SW 14 mph
precip
18%
NIGHT
88°F
W 14 mph
precip
25%
10.01
thu
DAY
86°F
NW 19 mph
precip
61%
NIGHT
88°F
NW 17 mph
precip
20%
10.02
fri
DAY
88°F
NW 19 mph
precip
17%
NIGHT
88°F
W 16 mph
precip
58%
10.03
sat
DAY
88°F
W 15 mph
precip
20%
NIGHT
88°F
W 14 mph
precip
20%
10.04
sun
DAY
88°F
W 12 mph
precip
9%
NIGHT
88°F
W 14 mph
precip
10%

Grand Cayman Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Grand Cayman was 30.8°F. The maximum and minimum values were 30.3°F and 31.3°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
July 90.9 °F
September 90.9 °F
Warmest sea temperature:
September 90.2 °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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