Recent National Weather Service model runs and ensemble guidance converge on a Seattle high near 62°F today, driven by steady onshore flow from the cool Pacific that caps daytime warming in the region’s maritime climate zone. Mid-May climatology shows average highs clustered in the upper 50s to low 60s, and the current synoptic pattern lacks strong offshore or downslope forcing that would push temperatures toward 64°F or above. Small differences in afternoon cloud cover, wind speed, or marine-layer depth now separate the closely matched 64°F-or-higher and 62–63°F bins in the market. Updated forecasts and any late-day observations will determine whether traders shift further toward the upper range before resolution.