You could probably just roll out big black tarp and connect to a vacuum. The black tarp would increase heating from sunlight and the vacuum would press the tarp to the ground and suck up the air. Then during the night you roll up and prepare for the next day.
Basically a rolling robot that rolls the tarp up, then continues rolling, then reverses and rolls the tarp back out.
But it would probably be better to just condense the water out of the air at night at a higher volume.