Weather and Climate

Cayo Guillermo enjoys a subtropical climate which is divided into two seasons: the WET SEASON between May and October, and the DRY SEASON between November and April. The dry season is also the busiest tourist season.

Cuba is located at the southwestern periphery of the North Atlantic high atmospheric pressure zone. Its climate is influenced by the northeast trade winds during the winter and east-northeast trade winds during the summer. Average annual temperatures do not fluctuate as much as rainfall does, making Cayo Guillermo a warm place to visit any time of year. Average daytime temperature usually ranges from 25 to 31 degrees C (mid 70s to high 80s) See the table of monthly averages below.

Since Cayo Guillermo is located off the northern coast of Cuba, there’s a greater risk of an occasional cold front (frente frio) between December and February, when temperatures can sometimes dip to 15-18 C (60s F) during the night so that the evenings may be cool. These cold fronts never last long, usually less than two days. When traveling during this period, it’s wise to bring warmer clothes (sweater or light jacket) for the evenings, just in case.

The hottest months are from June to September, but the trade winds and marine breeze help to keep things tolerable when the heat and humidity rise. During the wet season there are more mosquitoes, it’s recommended to bring a good repellent with a high content of DEET, the cream types (such as Watkins) are usually to most efficient.

September-October is the peak of the hurricane season, and consequently the cheapest time to travel. A major hurricane does not come every year, but when it does it can cause severe damages, flooding, and ordered evacuations.

Our favorite time to travel (weatherwise) is the transitional months between the two seasons, which are: April and November. These months are usually sunny and warm (both day and night), but without the hot and sticky discomfort of the summer months, and without the risk of cold front of the winter months (mid-December to February). The weather in March is usually nice too, but it's more expensive.

Maximum (Day Time) Temperature (in °C)

Minimum (Night Time) Temperature (in °C)

Rainfall (in mm)

Sea Temperature (in °C)

Number of Days with Rain

Relative Humidity (%)

NOTE: You should never take too seriously the weather forecast for tropical destinations, such as the Caribbean, because the climate is unstable therefore very hard to predict, especially during the wet season (May to October) when rain is forecasted almost daily. It may indeed rain a little each day, but most often as a short tropical downpour (usually in late afternoon or at night), it rarely rains for several hours straight.

Lily & Normand
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