Trader sentiment for Taipei’s August 16 high centers on 35–36 °C because official Central Weather Administration guidance and ensemble models indicate a typical mid-August subtropical ridge supporting afternoon peaks near 34–36 °C, with urban heat-island effects in the basin amplifying readings. Frequent thundershowers (90 % PoP) introduce the main uncertainty, as earlier or heavier cloud cover could suppress the maximum by 1–2 °C while clearer intervals allow brief spikes toward 36 °C. Historical climatology shows mid-August averages of 32–34 °C but frequent excursions above 35 °C under similar ridge patterns, aligning with the close 41.5 % / 32.5 % market split between the two leading outcomes. Updated model runs and midday observations will refine steering and timing of convection ahead of resolution.