Recent forecast model runs from the Central Weather Administration and global ensembles indicate a narrow range of possible daily maxima in Taipei on May 19, with most guidance clustering between 30°C and 33°C amid building subtropical ridge influence and lingering moisture from the early Meiyu frontal system. This distribution underpins the market’s near-even split between the 31°C and 32°C outcomes, each carrying 21.5% implied probability, while the 30°C and 33°C bins absorb the next-largest shares. Afternoon sea-breeze convergence and variable cloud cover introduce the primary uncertainty, as even modest shifts in low-level flow or insolation can alter peak temperatures by 1–2°C. Historical climatology for mid-May shows a typical maximum near 29–30°C, yet recent model consensus has trended slightly warmer, sustaining trader focus on the upper 20s to low 30s ahead of the final observational verification.