Trader sentiment for Austin's March 28 high temperature reflects a tight split driven by divergent global weather models, with NOAA's GFS ensembles leaning toward 80°F+ (27.5% implied odds) via a potent upper-level ridge fostering subsidence and southerly winds, while cooler ECMWF runs cluster around 72-75°F (topping 62% combined probability). Official forecasts from the National Weather Service peg the high near 78°F, but model spread highlights uncertainty in boundary-layer mixing and cloud cover persistence amid recent warming trends. Historical March data shows average highs of 74°F, with 80°F+ outliers tied to clear-sky insolation; afternoon heating thresholds will differentiate these bins as 18z updates loom.