Shingles are more uncomfortable in heat - try wearing something non synthetic and loose.
If You Have Shingles, Can You Work Out Side In The Sun All Day?
I would say it depends on more of what the reaction of the medicine would be for the treatment herpes zoster virus...if it reacts to the heat / suns rays. Like blood pressure medicines do...check with your doctor...
No, you would eventually overheat and need to get out of the heat of the sun.