Weather of Cienfuegos,Cuba The average temperature in Cienfuegos is 25 degrees Celsius throughout the year. The proximity to the mountains of the Guamuhaya group and the Caribbean Sea, which borders the southern part, soften the atmosphere of the city. When talking about the climate in Cienfuegos, we must say that the hottest months are usually July and August, and the coldest, December and January. Only in the mountains does the temperature drop below normal and the frequency of rainfall increases, especially in the months of May to October. The hurricane season, as in all of Cuba, is mainly understood between the months of June to November.