Trader consensus on Polymarket closely splits between 88-89°F (29%) and 90-91°F (29.5%) for Austin's highest temperature on April 17, reflecting National Weather Service guidance and model ensembles forecasting peaks near 89°F amid a post-frontal warming trend. After early April's stormy pattern with heavy rains and weak cold fronts that capped highs in the 70s, high pressure ridging over Central Texas now promises mostly sunny skies, light southerly winds around 5-10 mph, and strong daytime heating with dewpoints in the 60s°F favoring boundary layer mixing. GFS and ECMWF show tight agreement but subtle differences—ECMWF slightly cooler with possible afternoon cumulus clouds trimming peaks by 1-2°F, while hi-res NAM runs hint at 91°F under clear conditions—highlighting the razor-thin factors differentiating these bins. Updated 12z model runs and morning soundings today will sharpen resolution criteria at official stations like Camp Mabry.