Post-frontal warming after a strong cold front and associated cut-off low (Aug 9–12) is the main driver positioning 27°C (42.5%) and 28°C (30%) as leading outcomes for Cape Town’s August 13 maximum. High-pressure ridging behind the system promotes subsidence, clearer skies, and reduced cloud cover, allowing greater daytime insolation and modest warm-air advection to lift temperatures above the seasonal August average of roughly 18–20°C. Official guidance from the South African Weather Service notes fine and warm conditions in the west, while forecast models converge on a 25–28°C range, with lower probabilities for outliers reflecting uncertainty in exact boundary-layer mixing and wind speeds. Traders are weighting recent model runs showing recovery from the prior cold, wet spell.