The problem is that you will get a huge difference in day and night temperature, and that, together with any wilting, will make your tomatoes prone to blossom end rot.
I aim for no more than 25 deg. I don't find the auto vent opener much good, it does not open at a low enough temperature and as far as I know there are no adjustable ones on the market. I use green shade netting on the outside which I can easily take down if the weather turns cloudy.
Gillie