Current forecasts from the National Weather Service and private models indicate San Francisco's October 5 overnight low will likely fall in the upper 50s to low 60s°F, driven by a persistent upper-level ridge suppressing the marine layer and reducing onshore flow. This setup has produced above-normal minimum temperatures in recent days, with historical October averages near 55°F and rare extremes below 50°F. Trader emphasis on the 74°F-or-higher outcome at 49% implied probability appears anchored in expectations for sustained warmth, while the cluster of mid-50s to low-70s bins at 34% each reflects uncertainty over exact ridge erosion timing and any late marine intrusion. Updated model runs and NWS briefings over the next 48 hours will clarify whether cooling arrives before the daily minimum is recorded.