**Persistent marine layer influence and typical June climatology keep San Francisco's coastal temperatures moderated, with market-implied odds clustering around 68–71°F for the June 19 high.** National Weather Service discussions highlight a 1,000–1,500-foot-deep marine layer producing widespread morning stratus and fog that limits daytime heating along the immediate coast, while AccuWeather long-range guidance projects daily highs mostly in the 63–70°F range. This aligns with the June average high near 67°F at official stations and the strong historical preference for onshore flow and upwelling that prevents significant warming. Differentiation between the leading 68–69°F (29.5%) and 70–71°F (23.5%) buckets hinges on subtle model differences in marine-layer depth, afternoon clearing timing, and any minor high-pressure ridging that could allow slightly more sun. Recent patterns show the layer re-forming nightly with only partial inland burn-off, supporting the tight probability spread and low odds for extremes above 74°F or below 64°F. Updated forecast runs and NHC/NOAA coastal observations will be the key near-term drivers.