Recent National Weather Service model guidance shows Seattle-Tacoma International Airport on track for a daily maximum near 62°F tomorrow, with a narrow range of 60–64°F supported by light onshore flow from the Pacific and variable marine-layer cloud cover. Ensemble spreads remain tight because mid-level ridging is weak and steering winds are modest, limiting both warming and cooling potential. Historical mid-May climatology places average highs in the upper 50s to low 60s, so the current pattern sits near the seasonal mean without strong warm or cold advection. Traders have priced the 62–63°F bin highest at 36 percent, reflecting this consensus while still assigning meaningful probability to a modest warm-side excursion if afternoon sun breaks through earlier than expected. Updated NWS briefings later today will provide the final model runs ahead of resolution.