Even though you just put them in their coop, are they used to spending the day outside? If they aren't used to being out all day I'd only do a short time in the morning hours and then bring them back in to the basement. If they have been spending their days outdoors though I have some advice to help them with the high heat.
Make sure there is plenty of shade for them and loose dirt for them to dig a cool spot in. Normally, I wet the ground for them when it is super hot, but I skip it when it is that humid because the extra dampness makes it hard to breath. If you have any empty 2 liter bottles, milk jugs or even regular sized water bottles, fill them with water and freeze them tonight. Tomorrow in the heat of the day you can set those around the run for them to lay against to cool off. I place the frozen 16 or 20 oz bottles inside the waters so they have nice cool water all day. Set up a box fan so that they can lay in the path of the breeze if they'd like. Provide cold treats- watermelon is a favorite. You can also add the animal electrolytes from the feed store to their water if you have any handy.