Research from ~20 years ago forecast this result, I'm not sure it's entirely unexpected, although the focus in those studies was on air temperature alone:<p>> Because of the loss of life, damage to crops and vegetation in general and the impact on water supplies, these recent heat waves have stimulated much interest in their climatological features, recurrence times, and, especially, whether they are a portent of greenhouse-induced climatic change. For example, Trigo et al. (2005) state that the hot summer of 2003 in Europe exceeded any over the past 500 yr, and Schär et al. (2004) claim that this event was statistically very unlikely, and was also consistent with results from climatic change simulations. Stott et al. (2004) estimate that past anthropogenic influences doubled the probability of the occurrence of the 2003 heat wave. More intense and frequent heat waves are also predicted by Meehl and Tebaldi (2004) and Beniston (2004) on the basis of greenhouse simulations.[1]<p>[1] <a href="https://journals.ametsoc.org/view/journals/clim/20/15/jcli4224.1.xml" rel="nofollow">https://journals.ametsoc.org/view/journals/clim/20/15/jcli42...</a><p>In the climate science literature, there's a recent focus on the humidity factor:<p>> Recent studies have pointed to a growing concern on increasing heat stress considering humidity effects as well as extreme temperatures. Kang and Eltahir emphasized the important role of humidity, and pointed out that North China Plain is likely to experience deadly heat waves with wet-bulb temperature exceeding the threshold defining what Chinese farmers may tolerate while working outdoors [15]. By applying 35 °C as a threshold for human adaptability, Pal and Eltahir predicted that extremes of wet-bulb temperature in the region around the Arabian Gulf are likely to approach and exceed this threshold under business-as-usual emission scenarios [16]. Lin et al. determined trends of heat wave variation and stress threshold in three major cities of Taiwan based on WBGT, and suggested that the heat stress in all three cities will either exceed or approach the danger level (WBGT ≥ 31 °C) by the end of this century [17]. Russo et al. quantified humid heat wave hazards in the recent past and at different levels of global warming using the apparent temperature, showing that humidity can amplify the magnitude and apparent temperature peak of heat waves [11]. There have also been some studies assessing the adverse effects of heat stress on health and labor productivity [18,19]. [2]<p>[2] <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6539408/" rel="nofollow">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6539408/</a><p>Ultimately this is going to result in population migration away from the most severely affected areas, or drastic (and expensive) measures like shifting to living underground in termite-mound-like habitation will have to be implemented.