Forecasts from the National Weather Service and other models show Chicago temperatures peaking in the upper 70s°F today before falling overnight under increasing clouds, with showers and thunderstorms likely after 10 p.m. This setup, driven by a northeast wind shift and cooler air advection behind a weak front, supports an official daily minimum in the low to mid-60s°F. Trader consensus clusters tightly around 64–71°F bins because model runs differ slightly on the exact timing and depth of cooling, while probabilities drop sharply below 60°F or above 72°F given the current trajectory and historical October norms near 47°F. Updated NWS guidance and station observations through midnight will refine resolution.