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Under global warming, extreme high temperatures (EHTs) have become frequent and enhanced around the world. However, we found that the frequency and intensity of EHTs in Central Asia (CA) are decreasing over the last four decades when the effects of climate warming are removed. From 1979 to 2020, an interdecadal shift in CA's EHTs occurred around the mid‐1990s, preceded by high values (1983–1997) and followed by low values (1998–2016). The observational analysis and numerical simulations using National Center for Atmospheric Research Community Atmosphere Model version 5.3 both demonstrate that the phase transition of Atlantic multidecadal oscillation (AMO) has an important influence on this interdecadal shift. During 1998–2016, the AMO was in a positive phase (+AMO), meaning warmer sea surface temperature anomalies (SSTA) in the North Atlantic, which could lift the geopotential …