**Trader sentiment for São Paulo’s lowest temperature on August 24, 2026, clusters tightly around 13–15 °C because multiple official and model forecasts converge on overnight lows in that narrow band.** Recent guidance from INMET, AccuWeather, timeanddate, and other sources shows a daytime high near 20–21 °C under southeasterly flow, followed by clear to partly cloudy skies that permit moderate radiational cooling after sunset. This setup typically produces minimums of 12–14 °C at standard urban stations, consistent with August climatology for the region (average lows near 13–16 °C). Key differentiating factors include exact cloud cover timing, wind speed (light winds enhance cooling), and the precise station used for official readings. A slightly earlier clearing or calmer conditions could push the minimum to 12–13 °C, while lingering cloud or a modest warm-air intrusion favors 14–15 °C. The non-negligible probability attached to 19 °C or higher likely reflects residual uncertainty about whether the recorded low occurs before or after the calendar day cutoff or minor model spread, but current observations and short-range guidance favor the lower cluster. New model runs and INMET updates overnight will be the next catalysts.