Taking the local weather in Uster 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 July and August, with an average temperature of 16°C, while the coldest months are February and January, with an average of 1°C. The rainiest months in Uster are August, June, July and May, with each month seeing an average of 214 mm of rainfall.