Current National Weather Service forecasts for San Francisco on September 28 indicate sunny skies with a daytime high near 66–68°F, driven by moderate onshore westerly flow and a suppressed marine layer that limits afternoon warming along the immediate coast. This positioning aligns with the market’s tight clustering around the 68–69°F and 70–71°F outcomes, reflecting trader assessment of typical late-September climatology and minimal risk of stronger offshore winds or clear-sky radiative heating that could push readings higher. Model consensus shows low precipitation chances and steady sea breezes, though small revisions in boundary-layer moisture or wind direction before resolution could shift the daily maximum by 1–2°F. Updated NWS and global model runs over the next 48 hours will provide the clearest signals for any adjustment.