**Trader sentiment for Cape Town’s lowest temperature on August 21, 2026, clusters tightly around 7–10°C (roughly 33–34% implied probability each), reflecting genuine forecast uncertainty near the typical winter minimum.** August climatology shows average overnight lows near 11°C, but a series of cold fronts this week has suppressed coastal temperatures along the Western Cape, with clear or partly cloudy skies and moderate southerly winds promoting radiational cooling overnight. Official guidance from sources like AccuWeather and local models points to a minimum in the 9–12°C range, driven by high-pressure ridging behind the fronts, light winds allowing boundary-layer decoupling, and the cooling influence of the Benguela Current. Slight differences among the leading outcomes stem from model spread on exact wind speeds (which mix warmer air downward if stronger), timing of any fog or cloud cover, and microscale effects around the city versus the airport. Probabilities for 5°C or below remain minimal (1%), as current conditions lack the extreme cold-air advection or clear, calm setup needed for such outliers. New model runs and official minimum observations will likely narrow the range before resolution.