
I have had a litter in July and one prior to that in a very hot spell at the start of September. It was a nightmare with unhappy whelps and Mum. I froze bottles of water and put in the whelping box. So much easier to keep warm than cool down.
The worst thing for me living in a suburban house with lots of neighbours is early waking once pups are 5 to 8 weeks old. Also if it is hot they will sleep all day and want to play at night, nd a litter of that age can be anything but quiet.
As you know our breed won't stay confined for any length of time in a puppy pen by that age, but want the freedom to go outside and keep clean, stretch their legs in boisterous play etc.