Taking the local weather in San Nicolás Buenos Aires 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 April and May, with an average temperature of 19°C, while the coldest months are January and December, with an average of 14°C. The rainiest months in San Nicolás Buenos Aires are June, May, April and September, with each month seeing an average of 286 mm of rainfall.