**Trader consensus centers on a 27–29°C range for Toronto’s August 9 high, with 28°C holding the clearest edge at 46% implied probability.** Official Environment Canada guidance and recent model runs point to a high near 27–28°C under partly cloudy skies with light southwesterly flow and modest humidity, limiting strong daytime heating. AccuWeather and ensemble guidance similarly cluster around 27–28°C (81–82°F), reflecting a post-warm-spell moderation after early-August heat and scattered thunderstorms. Key variables include the exact timing of any cloud build-up or isolated showers, which could cap the peak 1–2°C lower, versus clearer conditions that might allow brief excursions toward 29°C. Historical August climatology places typical highs near 26–27°C, so current guidance sits slightly above average but without signals for extreme outliers. Updated model runs and the evening Environment Canada briefing remain the next high-impact data points before market resolution.