Taking the local weather in Black River 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 August and September, with an average temperature of 25°C, while the coldest months are February and January, with an average of 22°C. The rainiest months in Black River are September, October, May and August, with each month seeing an average of 248 mm of rainfall.