Recent National Weather Service forecasts and short-range model consensus point to a San Francisco high temperature on August 12 in the upper 60s to low 70s, shaped by persistent marine layer stratus and moderate onshore flow from the Pacific that limits daytime warming. Ensemble guidance shows modest variability in the timing of any afternoon clearing and wind speeds, which directly influences whether the peak reaches 70–71°F or stays near 68–69°F. Historical August averages near 69°F provide context, while the close market-implied odds underscore genuine forecast uncertainty typical of coastal microclimates where small shifts in the sea breeze can alter the daily maximum by several degrees. Updated model runs and the next NWS discussion will likely refine these probabilities ahead of resolution.