To me, it seems like extreme weather of any kind affects my arthritis and fibromyalgia. Whether that be prolonged rain (lasting for a couple of weeks or more), high heat, storms, bitter cold, etc. I live in Louisiana so it's a pretty mild winter here but when we do get really cold snaps, I have a flare up, but also when it is very hot and humid as well. I tend to do well in fall and spring when there are no weather extremes except storms. When we had our last hurricane, I thought I was going to die from the pain! (not the hurricane)
I eat healthy and exercise daily but it does not thwart flare ups when the weather abruptly changes, though I think it does reduce the amount of pain involved.
Do you find that extreme heat affects you at all?