take light, loose clothing
consider taking a stretcher bed to get yourself off the ground and increase air circulation under you
take a tent that will allow maximum air flows
an almost fully mesh tent is ideal for keeping the bugs out but letting you cool down in what ever breeze there may be
importantly you need to be able to create a cross-breeze as a minimum and set the tent up to capture as much breeze as possible
consider taking a slightly larger tent than usual if possible to ensure you are not to cramped to another person eg. for two hikers, take a 3P mesh tent
No-See-Um mesh will reduce the breeze - consider bringing a double mosquito net to set up in the tent so you can leave the mesh doors open
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alternatively, consider:
consider a tent with a Blockout fly to create a darker experience and reduce the radiant heat somewhat as well as allow you to sleep in longer in the morning
this will still be far too hot if set up in the sun on a day which is 30degC or more in the shade!
you should also put a shade tarp over the top of the tent with some separation from the fly for air flow
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set the tent up late in the day so the sun does not heat it up too much
choose a camp site that will get as much shade from the sun as possible - this may allow you to have a bearable spot to relax in during the midday sun
consider choosing a camp site near water and especially with the breeze flowing over the water towards you
bring a tarp or sunshade to cover the tent and be about 1' above it to shade from the sun and allow ventilation between it and the tent
at night, remove the fly if rain or thunderstorms are not forecast
bring a battery operated or 12V fan
bring an inflatable pool to sit in or go for a swim if it is safe to do so (preferably with some shade)
take plenty of drinking water to ensure you stay hydrated