In my older & heavier breed birds, when it gets really hot, they do stop laying - but I am talking heat wave kind of hot - and not for just a day or two. The Buckeyes look to be a true dual purpose breed - so that may be part of it
(I find my heavy breeds - like Brahmas, lay well through the winter and are more sensitive to the heat in the summer and 'take heat stress breaks' from laying. Whereas my lighter breeds stop in the deep cold spells of the winter and are less likely to stop laying in the heat.