Recent forecast models from agencies like Environment Canada and GFS ensembles indicate a high near 19–20°C for Toronto on September 28, driven by persistent cloud cover, northeasterly flow off cooler Lake Ontario waters, and light showers or drizzle that limit daytime heating. These conditions contrast with clearer, warmer patterns earlier in the weekend and align with climatological norms for late September. Model consensus shows modest uncertainty in peak timing and exact moisture amounts, with some runs allowing brief breaks to 21–22°C while others cap readings lower. Traders appear to weigh this narrow range heavily, as resolution hinges on official Environment Canada observations at Pearson Airport. Updated model runs and morning observations tomorrow will likely refine the outcome.