Environment and Climate Change Canada forecasts indicate Toronto's highest temperature on April 17 will likely peak around 16–17°C at Pearson International Airport, the market's resolution site, under partly cloudy skies with a 30% chance of showers, driving trader consensus toward these closely matched outcomes at roughly equal implied probabilities. This reflects ensemble agreement from GFS and ECMWF models, which show slight spreads due to uncertainties in cloud cover timing—a fuller morning overcast could cap highs at 16°C by limiting solar heating, while earlier clearing favors 17°C amid light southerly winds and above-normal warmth from a persistent upper-level ridge. The 15°C-or-below option gains traction from cooler model outliers and recent overnight lows near 8–10°C. New hourly guidance and afternoon soundings expected today could refine these margins before resolution.