**Forecast models and recent observations position 66-67°F as the most probable overnight low for Los Angeles on September 23, 2026.** Multiple sources, including National Weather Service guidance and ensemble runs, indicate nighttime temperatures in the upper 60s under mostly clear to partly cloudy skies with light onshore flow and a moderating marine layer. This aligns with the market’s heaviest weighting at 54% for that bin, while adjacent ranges (64-65°F and 68-69°F) capture residual uncertainty in boundary-layer mixing and exact timing of any coastal stratus. Late-September climatology shows an average low near 63°F, yet persistent high pressure and above-normal sea-surface temperatures this season have supported warmer nocturnal readings. Recent days have seen lows in the mid-to-upper 60s, with minimal cooling expected overnight into the 23rd absent a stronger offshore wind event. Traders appear to be pricing in the consensus from the latest model cycles, which show limited spread and no sharp cold-air advection. Key upcoming data include the next NWS forecast updates and any revised model guidance on marine-layer depth, which could nudge probabilities if stratus thickens or clears earlier than expected. The current distribution reflects measured trader assessment of these stable, mild conditions rather than extreme outliers.