re: Big Bend National Park

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We made the mistake of going in June-July for a family trip. I have never experienced heat like that in my life. Beautiful area but do NOT go during summer.

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I've been in the summer and so long as you stay hydrated I don't think it's a big problem at all, August in BR is worse.

Be sure you're drinking lots of water (with electrolytes to avoid hyponatremia), you'll be sweating all of it very quickly. The key is to find a shady spot to cool off during "siesta" hours (early afternoon) and you're fine the rest of the day. You just want to be in shade as much as you can and your sweat glands will cool you off. After hiking Big Bend I understood why Mexicans wear sombreros.

Nighttime can get chilly, even in the middle of summer. This area has some of the largest daily temperature swings in the US, I rode out a hailstorm near Marfa once and had to put on my sweater - in July.