**Trader sentiment for Cape Town’s highest temperature on June 15 centers on 15–17°C because recent cold fronts have established cooler-than-average winter conditions across the Western Cape.** June climatology places typical daily maxima near 17°C, but multiple passages of strong cold fronts in the preceding week have advected maritime polar air, suppressing temperatures and increasing cloud cover that limits daytime heating. Official guidance from the South African Weather Service indicates partly cloudy and cold conditions persisting into June 15, with model consensus pointing to a maximum near 16°C at representative stations such as Cape Town International. The market’s tight clustering—16°C at 42.5%, 15°C at 32.0%, 17°C at 25.5%—reflects this narrow forecast envelope, where small shifts in frontal timing, wind direction, or insolation could tip the outcome by 1°C. No major warming signals (ridge building or northerly flow) appear in the short-term guidance, keeping probabilities concentrated in this range while acknowledging residual model uncertainty typical of coastal winter forecasts.