I'll have to go against this forecast. The heat in May was the heat we all got, as the Atlantic belt dumped all its heat early. Now, the hurricanes are churning to the west of Mexico. No more heat is coming back. They'll probably get a cool and dry summer, just like us. Hopefully, we get a few spurts of rain.
ps. I'm thinking that in the interior, with stagnant air, you'll get the sun heat of 28, and cool nights, just like Manitoba.