Latest Environment Canada forecasts and ensemble guidance from GFS and ECMWF models point to Toronto's highest temperature on April 13 reaching 19-21°C at Toronto Pearson International Airport, fueling tight market-implied odds among these outcomes as traders weigh uncertainties in cloud cover and light precipitation from an approaching weak frontal boundary. Variable model runs over the past 24 hours show highs differing by 1-2°C based on the timing of partial clearing versus showers, which could suppress daytime heating under southerly flow ahead of the system. Above the mid-April climatological average of about 12°C, this mild setup reflects a temporary high-pressure ridge, though inherent short-range forecast divergence persists; expect refined probabilities from overnight model updates and morning soundings.