Traders assign the highest probability (28.5%) to a 70-71°F high for San Francisco on June 15 because National Weather Service and private model consensus points to mostly sunny conditions with onshore flow and a moderating marine layer limiting afternoon warming to the upper 60s or low 70s. June climatology favors cooler coastal readings near the long-term average high of 66°F, though a broader warm spell across the Bay Area has supported slightly elevated odds for 72-75°F bins. Key variables include the strength and timing of the sea breeze, potential for reduced fog, and any late adjustments in short-range guidance ahead of the daily maximum, which will be recorded at official NWS stations and drive final market resolution.