Persistent marine layer influence and a passing weak dry cold front are keeping San Francisco temperatures near or below seasonal norms for September 26, with National Weather Service forecasts indicating partly cloudy skies, highs around 66°F, and onshore southwest to west winds limiting daytime heating. Recent model consensus and observations show stratus lingering into the morning before partial clearing, consistent with historical patterns where coastal advection fog and the California Current suppress peaks despite the month’s typical 71°F average high. Trader emphasis on the 68–69°F bin reflects this moderation with modest upside potential if marine air thins faster than expected, while lower bins account for stronger onshore flow or delayed clearing; upcoming afternoon observations and any revised NWS updates will refine these implied probabilities.