Phongsali or Phongsaly is the capital of Phongsaly Province, Laos. It is the northernmost provincial capital in Laos, opposite Attapeu in the south…Phongsali or Phongsaly is the capital of Phongsaly Province, Laos. It is the northernmost provincial capital in Laos, opposite Attapeu in the south. The district had about 23,300 inhabitants according to the 2015 Laotian census. It lies at approximately 1,430 metres or 4,690 feet elevation on the slopes of Mount Phu Fa. Phongsali has summer temperatures around 25 to 30 °C, with frequent rain. In winter, from November to March, it is cool and mostly sunny, with daytime temperatures between 10 and 18 °C.