**Trader sentiment for Seattle's June 15 high temperature centers on the 88–91°F range, with 90–91°F holding the highest implied probability at 40.5% and 88–89°F at 29.5%.** This positioning reflects recent numerical weather prediction model runs that indicate a building thermal trough or ridge-induced offshore flow, allowing warmer continental air to reach the Puget Sound region and reduce the typical marine layer cooling. Forecast guidance from sources such as AccuWeather, BBC Weather, and ensemble models consistently points to daytime maxima in the mid-to-upper 80s, with some solutions reaching the low 90s if downslope warming and clear skies maximize insolation on the 15th. Historical June averages near 74°F provide context, while broader NOAA outlooks for above-normal temperatures across the Pacific Northwest this summer add supporting background without overriding the short-term synoptic pattern. Uncertainty remains because small shifts in the position of the upper-level high or residual marine stratus could cap readings in the mid-80s, explaining why lower bins retain modest probabilities. Updated model cycles and official National Weather Service briefings over the next 24–48 hours will likely refine these market-implied odds as the event approaches.