Recent National Weather Service forecasts and ensemble model consensus for Los Angeles on September 28 point to a minimum temperature in the mid-to-upper 60s, driven by a persistent marine layer and moderate onshore flow from the southwest that limits radiational cooling. Clear to partly cloudy skies overnight will allow some heat loss, yet elevated dew points and light winds near 5-10 mph should keep readings from dropping to seasonal norms around 62°F. Trader emphasis on the 66-67°F and 68-69°F brackets reflects this guidance, with minor spread arising from uncertainty in exact marine layer depth and timing of any clearing. Official resolution will hinge on the lowest hourly observation at primary stations such as Los Angeles International Airport or downtown through the 24-hour period ending at midnight.