National Weather Service forecasts and ensemble model guidance indicate a high near 70–73°F for San Francisco on October 13 under mostly sunny skies after morning clearing, supported by light northwest winds and a modest onshore marine influence that limits further warming. This aligns with the climatological average high of 70.8°F and explains the market concentration around 72–73°F, with secondary probability on 74–75°F reflecting minor upside from reduced cloud cover or slightly warmer 850 mb temperatures. A broader warming trend driven by northerly flow begins mid-week but has not yet strongly affected Tuesday, keeping odds on extremes below 1% while traders monitor the next model runs for any late adjustments in boundary-layer moisture or wind patterns.