**Official National Weather Service forecasts and model consensus point to a highest temperature of 73–75°F at Sea-Tac or similar Seattle stations on August 23, 2026, aligning closely with the market’s leading bins.** An upper-level low offshore is weakening and moving inland, maintaining onshore southwesterly flow and marine-layer moderation that caps daytime highs near or slightly below the 76°F climatological average. Morning clouds are expected to give way to mostly sunny skies with light winds, limiting further warming. Recent observations reinforce this range: August 22 recorded a high of 76°F, and early August 23 readings have trended in the low-to-mid 70s under similar conditions. No significant warm-air advection or offshore flow is forecast for the day, keeping the distribution tightly clustered around 72–75°F. Later in the week, building upper ridging will push temperatures into the low-to-mid 80s, but that shift arrives after today’s resolution window. Traders appear to be weighting the latest NWS point forecasts and ensemble guidance most heavily, producing the observed concentration of probability in the 72–75°F outcomes.