Trader consensus on Polymarket prices a 44.5% implied probability for Seattle's highest temperature on May 14 falling in the 58-59°F range, closely trailed by 60-61°F at 24.5%, reflecting National Weather Service short-range guidance and ensemble model runs from GFS and ECMWF centering forecasts around 59-61°F. This positioning stems from a sharp cool-down after record 82°F highs on May 12, driven by persistent onshore flow ushering marine stratus clouds over the Puget Sound, which cap daytime heating by reducing insolation even if clouds burn off by midday. A weakening upper-level ridge allows cool Pacific air advection amid typical May climatology of ~66°F averages, with lingering low clouds potentially trimming peaks toward 56-59°F; real-time observations through afternoon will clarify stratus dissipation timing and refine outcomes before evening resolution.