雖已減弱為熱帶性低氣壓，颱風白海豚帶來的暖濕空氣8月11日導致北京出現極端降雨[1]。位於順義的後沙峪地區1小時降雨量達88.5毫米，超過北京年均雨量528毫米的六分之一[1]，達到暴雨標準[1]。
中國氣象服務協會會長許小峰表示，"嚴格來講，白海豚對北京的影響是間接的"[1]。他進一步解釋，"它運輸的暖濕空氣，和北方的冷空氣、山脈，共同'合作'出了這場雨"[1]，說明此次極端降雨是颱風輸送的暖濕空氣、北方冷空氣以及太行山、燕山地形共同作用的結果[1]。據預測，8月北京平均降雨量將比常年同期偏多2至3成[1]。
Tropical Storm Baiji, though weakened from its typhoon status, unleashed extreme rainfall across Beijing on August 11, 2026, as the system transported warm and moist air into the region.[1] In the Houshayu area of Shunyi District, hourly precipitation reached 88.5 millimeters, exceeding one-sixth of Beijing's annual average rainfall of 528 millimeters and meeting the threshold for rainstorm conditions.[1]
Meteorological experts attributed the intense precipitation to the combined effects of warm, moist air transported by the tropical storm, cold air masses from the north, and the topographic influence of the Taihang and Yanshan mountain ranges.[1] According to Xu Xiaofeng, president of the China Meteorological Service Association, "the warm and moist air it transported, working together with cold air from the north and the mountain terrain, created this rainfall."[1] Looking ahead, forecasters expect August precipitation across Beijing to exceed historical averages for the same period by 20 to 30 percent.[1]