That's strange. I've grown spaghetti squash for about six years now and haven't run into that problem. Mine are a smaller version called Small Wonder. One is good for two people, a half for each. But variety size shouldn't have any bearing on this situation.
I can understand the heat interfering with fruit set but June is long gone and you should have had some by now.
What variety are you growing and what's the DTM?
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