Trader consensus on Polymarket prices a 27.5% implied probability for Seattle's May 10 high temperature in the 66-67°F range, driven by the latest National Weather Service (NWS) forecast models showing highs near 68-70°F under a building high pressure ridge promoting mostly sunny skies and above-normal warmth. However, high uncertainty—evident in the spread across 62-69°F outcomes—stems from persistent marine layer stratus clouds, common in Pacific Northwest spring, which could delay burn-off and suppress peaks to the mid-60s if winds remain light. Key variables include morning cloud clearance timing and model ensemble agreement; minimal precipitation risk keeps dry conditions likely. NWS updates expected through evening will refine guidance ahead of hourly observations resolving the market.