Pitch your tent where the shade is first thing in the morning, your tent will start to heat up as soon as the sun hits it in the morning.
All tents will get hot in direct sunlight, synthetic fabrics, polyester etc., tend to get hotter than natural materials. Cotton tents will be cooler than synthetics – but that extra comfort comes with extra weight and extra cost.
Leave the door zip open a bit at the bottom and make sure you open all the ventilation flaps or openings, hopefully air will flow through the tent and reduce the temperature and reduce condensation build up.
Some tents have UV Protection – this may help keep the heat out.
If there is very little breeze even with your tent doors and vents wide open then you could try a small battery powered handheld fan, which might help to circulate some air.
I’ve never tried this, but some people recommend a couple of emergency space blankets covering your tent to reflect the heat from direct sunlight. Make sure your tent can still breath, so don’t cover the ventilation gaps.
If you can’t put your tent in shade then create your own, and put a gazebo over your tent. Smaller and easier to Carry than a gazebo is a tarp, and you can angle a tarp so one side is lower giving you more shade – also if your tent is still too hot you can crawl outside, under the tarp, and carry on sleeping.
Apart from shade and ventilation, which are the two main ways to keep the heat down, you could try to remove heat from your tent . When the tent is out of direct sun in the evening spray water onto the outer tent and the evaporation might reduce the heat, or a wet towel might work the same way (again I have not tried these methods but some people have recommended them to me).
