Official meteorological observations from Sao Paulo stations recorded a maximum temperature of 19°C on September 16, driving the near-certain market-implied odds for that outcome. This aligns with typical late-winter conditions in the region, where cooler air masses and clear skies limit daytime warming under the influence of subtropical high pressure. Forecast models from agencies like INMET showed minimal deviation ahead of the date, reinforcing trader consensus backed by real capital. While data revisions or station-specific anomalies could theoretically shift results, such adjustments are rare once preliminary readings are verified against multiple sites.