National Weather Service guidance points to a high near 78°F for San Francisco on August 2 under mostly sunny skies, supported by a gradual warming trend and ridging aloft that allows modest offshore flow. Typical summer marine influence from the Pacific keeps readings well below interior heat-wave values, with sea-breeze strength, marine-layer depth, and cloud-cover timing serving as the key variables that can shift the daily maximum by one or two degrees. Model consensus remains tight around the upper 70s, yet small differences in wind direction or timing of any onshore surge create the narrow spread among the leading market outcomes. Updated short-range guidance and afternoon observations will refine the final recorded high used for resolution.