Taking the local weather in San Isidro 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 May and June, with an average temperature of 28°C, while the coldest months are February and January, with an average of 26°C. The rainiest months in San Isidro are December, January, July and June, with each month seeing an average of 347 mm of rainfall.