
File image of the aerial view of the Jinghong Hydropower Station on the Lancang River, the Chinese part of the Mekong River, in Jinghong city, Xishuangbanna Dai Autonomous Prefecture, southwest China’s Yunnan province. Imaginechina Limited / Alamy Stock Photo
The rainy season would usually start in May, but this was late June and it was still not raining much. Niwat Roykaew, who grew up on the bank of the Mekong River in Thailand’s northern Chiang Rai province, noticed.
Born and raised in the Chiang Khong district, Roykaew, 63, was taught to observe the Mekong River to tell the season. But, in the past two decades, the river has become unpredictable like it has “pulsated out of tune”.

“The water would get high for two days, then on the third day it would suddenly drop, even during the rainy season,” said Roykaew.
Local residents like him knew that this delay could mean another year of drought. Since at least 2019, that’s what has happened: the monsoon rain is late, and when it comes, it departs early.
The Mekong River’s water levels in the lower basin, including in Thailand, are now very unstable, being heavily affected both by climate change and hydropower dams upstream that are mostly powered by China, according to local residents, activists, and experts.