Official meteorological observations confirm Cape Town reached a daily maximum of 19°C on September 10, driving the market’s near-certain consensus on that exact outcome. South African Weather Service station data, aligned with standard surface observations, show stable conditions under a typical late-winter high-pressure ridge that limited daytime heating to this level, consistent with September climatology for the region. Traders have priced in the final recorded value with effectively no residual uncertainty. Only an official data revision or station-specific discrepancy could alter the result, though such adjustments are rare once preliminary readings are validated.