Taking the local weather in Serravalle Sesia 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 19°C, while the coldest months are January and February, with an average of 3°C. The rainiest months in Serravalle Sesia are November, May, October and April, with each month seeing an average of 197 mm of rainfall.