Originally Posted by
nashvillebill
It's already hitting 110 degrees F in Phoenix. Riding in the afternoon can cause heat stroke, there's no "getting used to it". Every summer one or two trail runners die thinking they can handle the heat while they attempt to run up Camelback Mountain. Even with proper hydration, physical exercise can create more heat than the body can disperse.
Heat stroke looks innocent or even lazy to bystanders, but can kill easily, especially if you are older, or having cardiac issues. So heat stroke should be prevented at all cost.
There for reduce heavy physical labour and exercise, if it is too warm. A better time for that is early in the morning and in the evening.
https://en.wikipedia.org/wiki/Heat_stroke
Don't wear warm or dark-colored clothing in the heat. However choose clothing that protects from dangerous tick-bites, when you walk in grass or forest.
Lie down in the shade, if you feel overheated, drink plenty of water in the heat, and always carry a telephone with you to call for help, if necessary.