I'm also new here and to having MG. In just the last few days I have had several encounters were heat quickly brought on weakness. Fortunately recovery was not terribly long either once I got cooled off.

I wonder, have others found a temperature at which they begin to notice effects? I'm trying to pay attention. I don't quite have a number but it seems to start well before "hot".

In in central Florida we have plenty of hot days, low 90s with heat index numbers in the low 100s. One thing I'm working on now is how to keep the parked car cooler.