Persistent high pressure and a heat ridge over the southern U.S. are driving trader consensus toward 98–101°F as the most likely range for Houston’s highest temperature on August 21. National Weather Service forecasts and model runs indicate mostly sunny skies with daytime highs in the upper 90s to low 100s, consistent with late-August climatology where average highs hover near 94–95°F but recent heatwave conditions have frequently pushed readings several degrees higher. Low humidity relief from onshore flow remains limited, supporting elevated surface temperatures, while the ongoing Heat Advisory through August 21 reflects peak heat-index values above 105°F. Final National Weather Service observations from official stations will determine exact resolution, with minimal rain chances keeping the window open for brief excursions above 100°F.