Recent NWS and ensemble guidance point to a Seattle high near 62–63°F on May 17 as the most likely outcome because a weakening offshore ridge is yielding to moderate onshore flow from the cool northeast Pacific. This pattern produces afternoon temperatures moderated by marine air advection and partial cloud cover, limiting solar heating compared with the early-May heat wave. Model spread remains narrow around the upper 50s to mid-60s, aligning with historical mid-May climatology at KSEA where average highs hover near 65°F. Traders therefore assign the greatest implied probability to the narrow 62–63°F bin while discounting both cooler marine-stratus scenarios and any brief warming from transient ridging.