截至9月16日11时40分，上海徐家汇站最高气温达35.6℃，锁定今年的第52个高温日，追平去年高温日 数历史第二位的纪录。根据上海气象部门统计，上海年高温日数排行第一名为1934年55天，2024年高温 日数52天居第二位，目前2025年高温日数并列第二位。 ...

Group 1 - The weather in Hangzhou is experiencing a significant fluctuation due to the influence of the subtropical high pressure, with temperatures reaching up to 35°C and a total of 59 high-temperature days recorded so far this year, tying with 2022 for the second-highest in history [1] - The upcoming week is expected to see a transition as cold air begins to penetrate, leading to a decrease in high temperatures, with forecasts indicating a drop to around 30°C starting Thursday [2] - Despite the current dominance of the subtropical high pressure, its influence is gradually weakening, allowing for the possibility of afternoon thunderstorms and rain, particularly in the northeastern regions [1][2] Group 2 - The cold air is anticipated to bring increased rainfall and a cooling effect across the province, with temperatures expected to drop significantly, especially in northern Zhejiang where highs may only reach 28°C [2] - The subtropical high pressure has been persistent since August, but its future strength remains uncertain as it may strengthen again after the current cold air system passes [2] - Continuous monitoring of weather patterns is advised as the interaction between cold air and subtropical high pressure will determine future temperature trends [2]