Trader sentiment for Toronto's April 4 high temperature reflects tight clustering around 8–11°C outcomes, driven by Environment Canada's latest forecasts projecting 9–12°C under cloudy skies with 60% chance of showers and a special weather statement for 25–50 mm of heavy rain. The slight edge to 11°C or higher at 24% stems from warmer ensemble guidance in recent ECMWF runs showing potential for partial clearing, while cooler GFS signals emphasize early-morning precipitation suppressing daytime heating. Differentiating factors include shower timing—early onset favors 8–9°C via increased cloud forcing and evaporative cooling—versus delayed rain allowing insolation-driven peaks near 11°C. Overnight model updates and morning observations will likely resolve uncertainties, as historical early-April highs average 9–10°C amid variable Great Lakes influences.