Official temperature observations from Environment Canada stations, including Pearson International Airport, recorded a daily maximum of 23°C in Toronto on September 15, 2026, under mostly cloudy skies with light southerly winds and limited solar heating. This aligned closely with pre-event model consensus from GFS and regional forecasts projecting highs near 22–24°C amid a stable air mass following cooler conditions earlier in the month. Trader consensus at near-100% for 23°C reflects high confidence in these verified measurements over historical averages of about 22°C. Minor revisions in station data or differing microclimate readings could theoretically shift the exact value, though such adjustments are rare after initial reporting.