**Trader sentiment for Cape Town’s lowest temperature on August 21, 2026, clusters tightly around 7–10 °C because a series of recent cold fronts has kept the region under cooler-than-average maritime air while clear skies overnight enable strong radiative cooling.** These fronts, passing south of the continent through mid-to-late August, have suppressed daytime highs along the west coast and left light, variable winds that allow the surface layer to decouple and lose heat efficiently after sunset. With dew points near 8–10 °C and minimal cloud cover, surface temperatures can drop several degrees below the daytime average of ~18–19 °C, yet the cold Benguela Current and proximity to the Atlantic moderate extremes, keeping the risk of readings at or below 5 °C very low. Forecast models differ mainly on the exact timing of wind shifts and the strength of nocturnal inversion, producing the narrow spread of implied probabilities across 7–10 °C. Historical August minima in Cape Town average near 9–11 °C, so the market is pricing a modest but plausible departure driven by the current frontal regime rather than any single dramatic event.