Official forecasts from Environment and Climate Change Canada indicate a daytime high near 21°C for Toronto on October 4 under partly cloudy skies with a chance of morning showers and southwesterly winds. This aligns closely with market-implied probabilities favoring 20°C, followed by 21°C, reflecting trader consensus on model outputs showing peak temperatures in the low 20s°C. The outlook sits above the 1991–2020 climatological average high of 17.7°C for the date, driven by warmer-than-normal steering patterns. Official station measurements will determine resolution, with minor variations possible from localized cloud cover or precipitation timing.