Latest numerical weather prediction models from Taiwan’s Central Weather Administration indicate a daily maximum in the 31–33°C range for Taipei on May 18, reflecting modest warming under a building subtropical ridge that favors clear to partly cloudy skies and light southerly flow. Ensemble guidance shows limited spread around this central tendency, with afternoon dew points near 24°C moderating the heat index while urban heat-island effects in the city center could add 1–2°C locally compared with suburban stations. Historical May climatology places average highs near 29–30°C, so the current market clustering around 31–33°C captures both the expected seasonal uptick and uncertainty from potential overnight cloud cover or brief showers that might trim the peak by a degree. Official resolution will hinge on the highest hourly reading at the designated Taipei station before midnight local time.