As someone already mentioned you can plant small root veggies like beets, radish, baby carrots and almost any greens like lettuce or spinach. You can still plant green beans for a Fall harvest, beans only take 50-70 days to harvest, so you should have just enough time.
Of course if you have a sunny window, you can always plant herbs to keep in the house when the weather turns cold. I grow dill, parsley, basil, fennel and even ginger all year. The dill and fennel will stay small in pots as long as you keep it picked or at least trimmed.
Hope this helps and remember, just because Summer is winding down and Winter is on the way, it doesn't mean you have to stop growing stuff, you just have to get creative about how you do it.
Have a great day and a better tomorrow!
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