i’m hot

tl;dr – stay cool, stay hydrated

Riding naked is frowned upon, and can be a little dangerous. Taking care of yourself is extremely important when it is hot out. You won’t always notice when you’ve gone too far, so having a plan to manage it is best.
Staying hydrated is the most important, followed by keeping your skin covered. I know no one wants to spend extra time stopping to visit the world’s sketchiest bathrooms but having to pee is better than passing out. Electrolytes are important, but honestly you get a bunch of salt from snacks, so water is your best bet. If you are cramping, get a sports drink, that does mean you are low on electrolytes. I always buy 2. One to drink and one to wear. This sounds silly, and no one likes being wet, but evaporative cooling is a real game changer. Sweat works by cooling you as it evaporates, but in Death Valley, it just isn’t enough. Pour that cold second bottle over your head, saturate your clothes, then ride. It’ll cool you for a little bit. If it is truly hot, like DV, carry a third with you to pour as you ride. I know it sounds silly, but you’ll thank me later. OK, back to the dehydration part. Seriously. Drink. As. Much. Water. As. You. Can. Hold. If you stop peeing, stop riding. This means you are seriously dehydrated, and you will start to go into heat exhaustion then heat stroke, neither is fun on two.
Keeping your skin covered. I know wearing too much gear can make you feel hotter, but sun stroke is not cool, and sunburns can cause long term damage and old-man leather skin. No one wants any of that. Mesh jackets, light-colored long-sleeved shirts, pants (please wear pants), etc. Will help keep the death star off your skin. If you are moving and that is all well ventilated, you won’t even notice. It is also more fabric to hold water for swamp AC (above).