**Forecast models from multiple sources, including GFS-based outputs and local analyses, indicate a minimum temperature of 11–13°C for Cape Town on September 28, 2026, under mostly clear skies with moderate southeasterly winds.** These conditions favor moderate overnight radiative cooling without the stronger cold-air advection or calm winds that could push readings toward single digits. Historical September averages near 10°C provide context, yet current spring warming and the absence of incoming fronts support the milder outlook. Trader sentiment reflected in the closely matched 48% odds on the 9°C-or-below and 19°C-or-higher tails highlights genuine model uncertainty and the binary resolution thresholds, while mid-range outcomes around 11–13°C align with the latest consensus. The next official SAWS briefing or updated model runs could refine these probabilities before market close.