Certainly peas and brassicas will not be able to stand it for more than a day or so. Most pole beans will struggle. Hopefully you are growing short day onions which should be finishing now. Other wise onions don't do well in heat. Pontiac potatoes should be close to finishing, but if they are late expect them to struggle. Shade will help as will plenty of water, but only summer vegetables like cowpeas, okra, lima beans, sweet potatoes okra etc do well when temps stay in triple digits.
