Recent National Weather Service forecasts for Seattle on August 9 project a high near 77–78°F under mostly sunny to increasing cloud conditions, directly supporting the tight market-implied odds between the 76–77°F and 78–79°F bins. This aligns with broader seasonal patterns of above-average warmth persisting through a 14th consecutive hotter-than-normal summer, driven by regional high pressure and reduced marine layer influence from the Pacific. Key differentiating factors include timing of afternoon cloud build-up, northwest wind shifts that could moderate peaks by a degree or two, and minor model variations in boundary-layer mixing. Traders weigh these against climatological August averages near 78°F while monitoring any late updates from official guidance before resolution.