Hi,
I have no idea if delaying treatment for a few months would be a risk but it's probably best to wait until August and see if his PSA has risen enough for the consultant to advise chemo is needed.
If he does need chemo it would probably take a couple of weeks to organise so unless we get a scorching September summer will be on its way out by then.
My husband had chemo (docetaxel) last year, May to August, and he had no ill effects; he lost a bit of his body hair but apart from that he was fine and we managed to get away for a few long weekends.
It's daunting to start on a treatment that can have unpleasant side effects when you're not even feeling ill and we've found the doctors and nurses seem to stress all the things that could go wrong but not everyone has side effects and the chemo brought his PSA down from 250 to 3.
Dave's probably a bit further down the road than Neil - he has extensive bone mets, his PSA is currently 411 and he's one treatment into cabazitaxel chemo.
My advice would be to enjoy the next few months and see what happens in August.
All the best to both of you.