Hongkongers sweated through the hottest day of the year on Friday, with the Observatory (HKO) recording a maximum temperature of 34.6 degrees Celsius at its headquarters. Yung Shue Wan, Lamma Island on Friday, June 5, 2026. Photo: HKFP. The mercury neared 37 degrees Celsius in the northern part of the territory. Maximum temperatures in Hong Kong on June 5, 2026. Photo: HKO. Meanwhile, the Observatory noted 1,263 instances of cloud-to-ground ligh…