Taking the local weather in Unión Oriental 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 October, with an average temperature of 25°C, while the coldest months are July and August, with an average of 23°C. The rainiest months in Unión Oriental are April, May, March and June, with each month seeing an average of 593 mm of rainfall.