**Cloud cover and elevated humidity from an active low-pressure system and strengthened southwesterly flow are keeping overnight radiative cooling limited across northern Taiwan.** Official Central Weather Administration guidance and numerical model consensus point to minimum temperatures of 25–27 °C for Taipei on 22 August, with urban heat retention and frequent showers preventing sharper drops. Persistent moisture and weak pressure gradients suppress the typical nocturnal cooling that would otherwise push readings below 25 °C, while also capping any brief clear spells that could allow a 28 °C floor. Traders therefore see the tightest implied probabilities clustered at 26–28 °C, reflecting the narrow forecast envelope between these competing influences ahead of the next model update cycle.