**A Cut-Off Low (COL) system is the dominant driver pushing Cape Town's September 3 high into the mid-teens Celsius, with market-implied odds clustering tightly around 14–17°C.** South African Weather Service forecasts and model consensus highlight cool, wet, and windy conditions on the day, with strong southeasterly winds (often 20–40 km/h gusting higher), extensive cloud cover, and periods of rain or showers that limit daytime heating. Multiple sources project daytime maxima of 14–16°C (roughly 57–61°F), well below the early-September climatological average of ~18–19°C. The system’s timing—peaking Thursday into Friday—introduces modest forecast uncertainty around exact peak temperatures and rainfall intensity, which explains the near-even distribution across 14°C, 15°C, 16°C, and 17°C outcomes. Stronger or more persistent onshore flow and heavier precipitation would favor the lower end of that range, while any clearing or lighter winds could allow brief warming toward 17°C. Updated model runs and official SAWS briefings over the next 48 hours will be the key data points traders monitor for shifts in these probabilities.