Persistent cloud cover and frequent heavy rainfall tied to the lingering East Asian plum rains and southwest monsoon are suppressing daytime heating in Taipei, keeping the June 13 maximum most likely in the 29–31 °C range. Official Central Weather Administration guidance and ensemble model runs show overcast skies and scattered showers limiting insolation, consistent with recent cooler readings near 25–27 °C. Trader consensus around 30 °C reflects the narrow spread between forecast highs once afternoon convection timing and boundary-layer moisture are accounted for, while lower or higher outcomes hinge on any unexpected clearing or intensification of rain. Updated model guidance expected within 24–48 hours will further refine resolution probabilities.