Forecasts for Toronto on August 23 indicate a daytime high near 21–22°C under partly cloudy skies with scattered showers and thunderstorms, followed by an overnight low in the 15–17°C range as northwest winds increase to 25–40 km/h. This pattern stems from a passing trough and associated cold front, which enhances mixing that limits radiative cooling while introducing cooler maritime air from the Great Lakes region. Historical climatology shows an average low of 17.1°C, yet interannual variance and short-term model spread—particularly in boundary-layer moisture and cloud timing—create substantial uncertainty around whether the minimum falls near 15°C or deviates higher or lower. Trader equilibrium between cooler and warmer extremes reflects these variables, with resolution hinging on official overnight observations from stations such as Toronto Pearson.