Persistent high-pressure ridging and a strong heat dome maintained extreme conditions across the Southwest, driving Phoenix temperatures above 110°F (often 113–117°F) for extended stretches in August 2026, with overnight lows rarely dropping below 89–93°F. National Weather Service data confirm Extreme Heat Warnings covered at least 21 days that month—well above the 10-day threshold—following an earlier period from late July into early August and a renewed stretch from mid-to-late August. Record daily highs and minimal monsoon relief reinforced trader consensus at 91.5% for Yes. Stronger-than-observed monsoon storms or an earlier pattern shift could have shortened the warning periods, though observed conditions left little room for such outcomes.