Official temperature observations from San Francisco weather stations on September 9, 2026, recorded a daily high of 92-93°F, driving the market's near-certain implied probability for that bin. National Weather Service and NOAA data from primary monitoring sites, including those near the airport and downtown, confirmed the peak under clear, stable atmospheric conditions with minimal marine layer influence or onshore flow. This outcome aligns with late-summer heat patterns where daytime warming exceeds typical September averages of 70-75°F. Resolution criteria rely on verified maximum readings rather than forecasts, leaving little room for revision unless station-specific discrepancies or quality-control adjustments emerge—scenarios that remain improbable given consistent multi-site agreement.