Cuba is located in the tropics - that has as  everything - pros and cons.
The temperature differences between the summer and winter months are low. Nevertheless, the maximum temperatures in July and August are about 35 degrees Celsius in the day and about 20-25 degrees in the night. In the other months around 30 night 15-20 degrees .. From May to October, the rainy season prevails in Cuba. In this time, some short but heavy showers are expected. There is very rare rain on Cuba. Between June 1 and November 30 is the hurricane season in the Caribbean,, where dangerous tropical cyclones form over the Atlantic Ocean, but the risk of being hit by a hurricane during your  Cuba vacation is small. In addition, Cuba has a very well functioning disaster protection. In the south and east of Cuba, the rainfall is generally lower than in the north.