The weather in Nan
Nan province has a tropical savanna climate. The winters (November to March) are quite dry and very hot. Temperatures rise until April which is the hottest month of the year. The monsoon season extends from late April to October, with heavy showers and cooler temperatures during the day, even if the nights remain warm.
The best time of year to come to Nan is from November to the end of March. August is the rainiest month so maybe avoid this period but during the rest of the monsoon season if the rainfall will often be torrential, they are also brief in general, allowing you to enjoy your stay the rest of the time.