Current Sea Water Temperature:
+90.8°F
| Maximum Sea Water Temperature in August: | 93.8°F |
| Minimum Sea Water Temperature in August: | 86.8°F |
| Average water temperature in August: | 89.9°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| August 23 | 90.8°F | August 18 | 89.4°F |
| August 22 | 91.0°F | August 17 | 90.2°F |
| August 21 | 91.4°F | August 16 | 90.4°F |
| August 20 | 90.0°F | August 15 | 90.0°F |
| August 19 | 90.0°F | August 14 | 90.0°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 2026 for Cayo Guillermo was 90.8°F. The maximum and minimum values were 89.4°F and 92.0°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Cayo Guillermo was 90.5°F. The maximum and minimum values were 89.6°F and 91.8°F respectively.
Cuba Resorts:
NAME
F°
| Cayo Coco |  |
+86 |
| Cayo Guillermo |  |
+90 |
| Cayo Largo |  |
+80 |
| Cayo Santa Maria | |
+90 |
| Cienfuegos | |
+82 |
| Havana | |
+86 |
| Holguin | |
+88 |
| Matanzas | |
+82 |
| Pinar del Rio | |
+82 |
| Playa Blanca |  |
+88 |
| Playa Esmeralda | |
+88 |
| Playa Santa Lucia | |
+88 |
| Santa Maria | |
+90 |
| Santiago de Cuba | |
+86 |
| Varadero | |
+90 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Cayo Guillermo
Local time: 07:49
23 aug, sunday
| 0900 |  |
90°F | W 14 mph |
| 1200 | |
92°F | W 14 mph |
| 1500 | |
92°F | W 17 mph |
| 1800 |  |
88°F | W 22 mph |
| 2100 |  |
88°F | W 17 mph |
24 aug, monday
| 0000 |  |
88°F | W 17 mph |
| 0300 | |
88°F | W 17 mph |
| 0600 | |
88°F | W 16 mph |