Recent National Weather Service and private model guidance for San Francisco on August 14 converges on a daily high of 66–69 °F, with partly to mostly cloudy skies, southwest winds of 10–20 mph, and a persistent marine layer that limits afternoon warming. This consensus underpins the near-even market split between the 68–69 °F (38.5 %) and 66–67 °F (33.5 %) bins. Key differentiating variables include the precise timing of any marine-layer clearing, cloud-cover fraction, and boundary-layer mixing depth; stronger onshore flow or earlier fog return would cap temperatures near 66 °F, while modest clearing and lighter winds could allow brief excursions to 68–69 °F. Historical August climatology (average high ~70 °F) and the absence of offshore flow or heat-wave signals keep higher outcomes at low implied probability. Updated model runs and morning observations on the 14th will likely resolve the narrow spread before market close.