Recent National Weather Service forecasts and supporting model guidance point to a San Francisco high near 80°F on October 4 under mostly sunny to partly cloudy skies, driven by upper-level ridging that has compressed the marine layer and allowed modest onshore warming. Coastal locations remain cooler than interior valleys due to persistent marine influence, light winds, and potential afternoon cloud build-up, which explains why market-implied odds cluster tightly around the mid- to upper-70s to low-80s rather than higher bins. Key variables differentiating outcomes include the exact timing of any offshore flow, marine-layer depth, and cloud-cover evolution, with ensembles showing limited but non-zero spread. Updated model runs and the next NWS discussion will provide the clearest signals before resolution.