Current sea water temperature:
+76.8°F
| Minimum sea water temperature in December: | 82.0°F |
| Maximum sea water temperature in December: | 75.9°F |
| Average sea water temperature in December: | 79.1°F |
| more information | |
14 days
forecast
forecast
| Cayo Guillermo |
monthly
weather
weather
| Cayo Guillermo |
Sea water temperature for the last 10 days:
| December 28 | 76.8°F | December 23 | 79.7°F |
| December 27 | 76.8°F | December 22 | 80.2°F |
| December 26 | 78.3°F | December 21 | 79.5°F |
| December 25 | 77.7°F | December 20 | 79.2°F |
| December 24 | 79.0°F | December 19 | 79.2°F |
Monthly sea water temperature, °F
When is the warmest sea in Cayo Guillermo?
Based on the data about daily sea water temperature for the last three years the warmest sea in Cayo Guillermo was noticed in September, August and July.
Monthly Sea Temperatures in Cayo Guillermo, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 87.3°F. The highest and lowest sea temperatures during the month were 88.3°F and 86.5°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 86.9°F. The highest and lowest sea temperatures during the month were 88.5°F and 85.8°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 85.3°F. The highest and lowest sea temperatures during the month were 86.2°F and 83.8°F.
current
weather
weather
| Cayo Guillermo |
weather in
January
January
| Cayo Guillermo |
Best time for vacation in Cayo Guillermo
Cayo Guillermo on a weather map
Places in Cuba:
Name
°F
24 Hours Forecast
Cayo Guillermo
Local time: 01:44
December 29, monday
0300
75°F
W
11 mph
11 mph
0600
73°F
W
9 mph
9 mph
0900
73°F
W
7 mph
7 mph
1200
73°F
SW
7 mph
7 mph
1500
73°F
SW
7 mph
7 mph
1800
73°F
SW
9 mph
9 mph
2100
72°F
SW
9 mph
9 mph
December 30, tuesday
0000
72°F
SW
7 mph
7 mph
