Squash

Hi, did you mean to add a photo? I would say that unless you have substantial plants in pots to put out then too late. Mind you if this weather continues and you can give plenty of water and feed then any plants would be worth planting out if you have the space.....

Could be worth a try after this very hot period, but squashes can take quite a long time to grow and develop, so you may or may not get them to mature in time.