Recent National Weather Service and model consensus forecasts for Chicago on October 15 indicate a high in the low-to-mid 60s°F, driven by persistent overcast skies, widespread rain, and easterly to southeasterly flow that limits daytime warming. These conditions align with the climatological average high near 64°F but suppress peak temperatures through reduced solar heating and evaporative cooling from precipitation. Current observations near 60°F early in the period support this range, with afternoon peaks unlikely to exceed mid-60s under 90%+ rain probability. Trader consensus on 64-65°F and 62-63°F outcomes reflects this stable forecast signal ahead of final daily observations.