Midwest's basic extract oatmeal stout looks OK. It comes with Munton's yeast, which will leave you with a relatively high finish gravity. That will the stout sweeter and leave it with more body than some kits.
Upgrading to the Wyeast Irish Ale would be a good move and give you a drier beer. But, if it's really hot out there, sticking with the Munton's would be wise.
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