**Persistent high pressure and offshore Santa Ana flow are sustaining an intense October heat wave across Southern California, keeping overnight lows elevated for Los Angeles on October 6.** Official National Weather Service forecasts and recent model runs indicate Tuesday night lows in the mid-60s to upper 70s °F (roughly 21–26 °C), well above the early-October climatological average near 61 °F, with limited radiational cooling under clear skies and weak onshore winds. This has produced the current market-implied distribution favoring 74–85 °F ranges, while the modest 4 % on 67 °F or below reflects the low probability of meaningful cooling before the ridge weakens later in the week. Traders are pricing in the latest ensemble guidance showing the heat dome persisting through midweek, with any downward revision in low-temperature expectations hinging on faster marine-layer intrusion or a stronger sea breeze than currently modeled.