Singapore's meteorological observations confirm a daily maximum temperature of 33°C on September 30, driving the near-certain market-implied probability for that outcome. Real-time data from official monitoring stations show peak readings aligned with this threshold under typical equatorial conditions, including high humidity and minimal diurnal variation, consistent with seasonal patterns where maxima often range 31–34°C. Strong consensus among traders reflects verified station reports rather than forecasts, as the day concludes. Minor revisions could theoretically occur from post-processing adjustments or microclimate differences across sites, though historical records indicate such shifts rarely exceed 1°C once the peak is established.