Warm southerly flow combined with abundant sunshine and a strong high-pressure ridge over central Texas is driving Austin’s daytime temperatures toward the upper 80s or low 90s on May 16. National Weather Service model guidance and recent surface observations indicate peak heating near 89–91 °F, consistent with the market’s heaviest trading on the 90 °F-or-higher and 88–89 °F brackets. This setup exceeds the long-term May average high of 86 °F at Austin-Bergstrom International Airport, reflecting above-normal warmth for mid-May. With little cloud cover or precipitation expected through the afternoon, the official high will hinge on the precise timing of maximum solar insolation and boundary-layer mixing before evening cooling begins.