Hah! this is exactly WHY I meal plan!! It always sounds better to me if I don't have to think up something on the spot, 'cause it's already PLANNED! I honestly, just go down the list. I plan six mondays. If I am not feeling creative, I use the family standbys. Then I plan six tuesdays. They're soup, so six favorite soups are easy. You get the gist. Honestly, one of the reasons I started planning (besides the "oh crap, we have no money, how can we save every single penny possible!" line of thought, of course) was that night after night, on my husband's way home from work, I'd stand in front of the fridge staring into it as if something would jump out at me already made, asking my husband for suggestions...and saying, "Nah, that just doesn't sound good tonight..."
So I started putting it on paper, and making it, pretty much no matter what. Amazing how good it sounds when it is on the table on time and everybody's belly is full of good food!
Of course, in that kind of heat I would be making stuff like french veggie sandwiches, egg salad, noodle/veggie salad, GRILLED foods (I mean OUTDOOR grilling), etc--the less heat involved in meal prep the better!