**Official observations from Toronto Pearson International Airport and Environment Canada stations recorded a daily maximum of 25°C on September 16, 2026, under mostly cloudy skies with limited afternoon clearing.** Hourly data showed temperatures rising from morning lows near 16–18°C to afternoon peaks of 24.5–25°C around 3–4 p.m. EDT, aligning closely with pre-event model consensus from GFS and regional forecasts that anticipated mid-20s readings amid weak high pressure and light northerly flow. This outcome sits slightly above the 1991–2020 climatological average high of 21.9°C for the date but well below historical extremes. Trader consensus at 100% for 25°C reflects the final verified reading; the only realistic challenges would involve post-event data revisions from the primary station or rare discrepancies across the Greater Toronto Area network, though such adjustments are uncommon once preliminary values stabilize.