Taking the local weather in Granges-Narboz into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are January and February, with an average of 1°C. The rainiest months in Granges-Narboz are December, June, May and August, with each month seeing an average of 223 mm of rainfall.