Official forecasts from the National Weather Service and major models point to overnight lows in the mid-60s at Los Angeles International Airport on August 31, reflecting persistent high pressure and moderate onshore flow that moderates radiational cooling. Key differentiators among closely matched bins include marine layer depth and timing, which control fog and cloud cover to suppress temperature drops, versus clear-sky conditions that enhance surface cooling; variable wind speeds that influence boundary-layer mixing; and subtle shifts in sea-breeze onset. Historical August lows average near 65°F, with limited model spread creating genuine uncertainty around 64–69°F versus lower extremes if stronger cooling develops before resolution.