Recent forecast guidance from Environment and Climate Change Canada places Toronto’s official high near 25 °C today under a mix of sun and cloud with light westerly winds and a 30 % chance of late-afternoon showers. This baseline supports the tight clustering of market-implied odds around 25–27 °C, where modest increases in solar heating or delayed cloud cover could push readings to 26–27 °C while any earlier showers or thicker cloud would likely cap the peak at 24–25 °C. Southwesterly flow is advecting warmer air from the U.S. Midwest, but boundary-layer moisture and variable insolation introduce the main uncertainty reflected in the closely matched probabilities for the top three outcomes.