Latest National Weather Service forecasts and model ensembles from NOAA, including GFS and ECMWF runs updated within the past 24 hours, indicate a tight consensus for Chicago's highest temperature on March 29 falling in the 58-63°F range, driven by a building upper-level ridge over the Midwest promoting warm air advection from the south and light southerly winds under high pressure. This setup favors above-normal readings—well above the mid-40s March climatology—but subtle differences in cloud cover timing and boundary layer mixing create the narrow spread differentiating top outcomes, with 60-63°F edging ahead on stronger diurnal heating in recent 12z projections. Trader-implied probabilities reflect this model agreement amid inherent spring forecast uncertainty, with new evening updates potentially refining the peak.