Recent forecasts from the National Weather Service and other models indicate a high near 76°F for San Francisco on September 30 under sunny skies with light onshore flow. This aligns with trader emphasis on the 74–77°F range, where probabilities cluster. Key variables include the strength and timing of the marine layer, which typically caps coastal highs through afternoon advection of cooler Pacific air, versus any brief offshore component that could allow greater warming. Historical September averages near 71°F provide context, while recent clear, mild conditions have supported modest inland heat influence without extreme offshore flow. Updated model runs and NWS briefings in the next 48 hours will refine the precise maximum.