Taking the local weather in San Pedro de Cartago into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually September and August, with an average temperature of 17°C, while the coldest months are August and July, with an average of 17°C. The rainiest months in San Pedro de Cartago are April, March, May and November, with each month seeing an average of 465 mm of rainfall.