It's not just the heat anymore, it's the duration.
I've lived in the Pacific Northwest all my life and, in my experience growing up, you could count on two-three days in late July/early August where the temperature would shoot up to 90+ degrees then drop back down to the seasonal average.
Now, the temperature rises to 90+ and stays there for a week or longer; and since the majority of residences don't have A/C, they don't get a chance to cool down at night, making it that much more uncomfortable/dangerous.
I've lived in the Pacific Northwest all my life and, in my experience growing up, you could count on two-three days in late July/early August where the temperature would shoot up to 90+ degrees then drop back down to the seasonal average.
Now, the temperature rises to 90+ and stays there for a week or longer; and since the majority of residences don't have A/C, they don't get a chance to cool down at night, making it that much more uncomfortable/dangerous.