Recent forecasts from the South African Weather Service indicate partly cloudy skies and isolated showers across the Western Cape for May 17, supporting trader consensus around a 20–21°C high in Cape Town. This positioning reflects the typical autumn transition, when Atlantic maritime air moderates daytime maxima while variable southeasterly winds and cloud cover can suppress or enhance warming by 1–2°C. Historical May averages near 19°C provide context, yet current model runs show slightly above-normal conditions due to reduced cold-air advection. Resolution hinges on the official maximum reading, with traders monitoring afternoon wind shifts and any late-day clearing that could nudge temperatures toward the upper end of the 19–22°C range.