Average temperature in Jamaica in February: 22 to 29°C, 72 to 84°F. Sea temperature in Jamaica in February: 26°C, 79°F. Average rainfall in February: 18mm, 0.7in. Events: To many, Jamaica is synonymous with reggae and Bob Marley; visitors to Jamaica in February can enjoy both at the Bob Marley festival in Kingston.he leeward side of Jamaica experiences less rain and less humidity. The Blue Mountains tend to be much cooler than Jamaica's beach towns. Temperatures in Jamaica average between 20 and 35 degrees Celsius (68 to 95 degrees Fahrenheit) throughout year.