National Weather Service models indicate strengthening onshore flow and a persistent marine layer will limit daytime heating in San Francisco on June 6, favoring a daily high in the low-to-mid 60s°F at official KSFO observations. This reflects the region’s climatological pattern of coastal advection from the cool Pacific, which typically caps early-June maxima near 68°F but yields cooler outcomes when winds turn westerly and stratus persists. Traders assign roughly two-thirds probability to the 62–65°F bins because ensemble guidance shows minimal warming potential absent a pronounced offshore shift. Slight model spread in boundary-layer mixing and cloud timing creates the narrow edge between 62–63°F and 64–65°F outcomes, with any unexpected clearing raising odds for the upper 60s. Updated NWS forecasts and real-time station data will resolve the market.