**Marine layer dynamics and onshore flow dominate near-term temperature outcomes for San Francisco on June 15.** Typical June Gloom conditions—persistent stratus and fog advected by the marine layer—limit daytime heating along the coast, anchoring official highs (measured at stations like KSFO) in the upper 60s to low 70s. Latest National Weather Service guidance shows morning clouds giving way to partial afternoon sun under a weakening Pacific ridge, supporting highs near 70–72°F, consistent with the tight clustering of market-implied probabilities around the 70–73°F bins (collectively ~57.5%). Key differentiating variables include the precise timing and depth of marine-layer erosion, wind direction (southwest flow favors slight warming), and any subtle ridging that could allow brief clearing. Historical analogs for mid-June show rare excursions above 74°F without strong offshore flow, keeping higher bins (74°F+) at low single-digit implied odds. With resolution tied to the next day's official observation, traders are weighting the most recent model consensus and short-range updates heavily, as even modest shifts in cloud cover or wind can swing the daily maximum by 2–4°F.