Current Sea Water Temperature:
+85.0°F
| Maximum Sea Water Temperature in December: | 85.6°F |
| Minimum Sea Water Temperature in December: | 78.8°F |
| Average water temperature in December: | 82.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 13 | 85.0°F | December 08 | 84.6°F |
| December 12 | 85.4°F | December 07 | 84.2°F |
| December 11 | 85.6°F | December 06 | 83.8°F |
| December 10 | 85.6°F | December 05 | 84.4°F |
| December 09 | 84.8°F | December 04 | 83.6°F |
When is the Warmest Sea for Cayo Guillermo?
According to our data for the last three years for Cayo Guillermo the highest average sea water temperature was in September, August and July.
Average Water Temperature by Month, °F
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Cayo Guillermo was 91.4°F. The maximum and minimum values were 90.6°F and 92.6°F respectively.
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Cayo Guillermo was 91.0°F. The maximum and minimum values were 89.8°F and 92.8°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Cayo Guillermo was 89.2°F. The maximum and minimum values were 87.6°F and 90.2°F respectively.
Cuba Resorts:
NAME
F°
| Baracoa |  |
+80 |
| Cayo Coco | |
+76 |
| Cayo Guillermo |  |
+80 |
| Cayo Largo | |
+74 |
| Cayo Santa Maria | |
+80 |
| Havana |  |
+78 |
| Holguin | |
+76 |
| Manzanillo | |
+74 |
| Niquero | |
+74 |
| Playa Esmeralda | |
+80 |
| Playa Santa Lucia | |
+80 |
| Santa Maria | |
+80 |
| Santiago de Cuba | |
+72 |
| Trinidad | |
+76 |
| Varadero | |
+78 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Cayo Guillermo
Local time: 02:20
14 dec, sunday
| 0300 |  |
80°F | W 11 mph |
| 0600 |  |
80°F | NW 4 mph |
| 0900 |  |
82°F | SE 2 mph |
| 1200 | |
82°F | S 7 mph |
| 1500 | |
80°F | SE 8 mph |
| 1800 | |
80°F | S 12 mph |
| 2100 | |
82°F | S 15 mph |
15 dec, monday
| 0000 | |
80°F | S 17 mph |