Current sea water temperature:
+87.6°F
| Minimum sea water temperature in September: | 89.6°F |
| Maximum sea water temperature in September: | 83.1°F |
| Average sea water temperature in September: | 86.0°F |
| more information | |
14 days
forecast
forecast
| Cayo Guillermo |
monthly
weather
weather
| Cayo Guillermo |
Sea water temperature for the last 10 days:
| September 13 | 87.6°F | September 8 | 87.3°F |
| September 12 | 86.9°F | September 7 | 87.8°F |
| September 11 | 86.9°F | September 6 | 87.6°F |
| September 10 | 87.6°F | September 5 | 87.1°F |
| September 9 | 88.3°F | September 4 | 87.1°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 86.8°F. The highest and lowest sea temperatures during the month were 87.8°F and 85.5°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 86.4°F. The highest and lowest sea temperatures during the month were 87.6°F and 85.6°F.
current
weather
weather
| Cayo Guillermo |
weather in
September
September
| 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: 18:46
September 13, sunday
2100
84°F
W
14 mph
14 mph
September 14, monday
0000
84°F
W
13 mph
13 mph
0300
84°F
W
14 mph
14 mph
0600
84°F
W
13 mph
13 mph
0900
84°F
W
14 mph
14 mph
1200
84°F
W
11 mph
11 mph
1500
86°F
SW
14 mph
14 mph
1800
84°F
SW
15 mph
15 mph
