Recent National Weather Service forecasts indicate a high near 77–79°F for San Francisco on September 23, driven by a building ridge that has initiated a brief warming trend after cooler marine-influenced conditions. Patchy morning fog and variable onshore winds typical of the region’s coastal microclimate introduce uncertainty in peak temperatures, with model guidance showing minor spreads in afternoon clearing and wind patterns. This aligns with the tightly clustered market-implied probabilities around 76–81°F, as traders weigh the balance between gradual ridging aloft and persistent cool marine air. Updated NWS model runs and evening observations will provide the next key data points ahead of the daily high’s determination.