I'm not a total expert in concrete but I'll get you started.
In hot weather, you want to avoid having the concrete dry too fast. Sometimes, this is why you see it covered w/plastic or you see someone 'misting' it.
As far as honeycombing, I have a couple of links I found that talk about it. Honeycombing apparently doesn't have anything to do w/the temperature. Instead, it has to do w/the consolidation (or settling) of the mix when it's poured. Review them and see.
Problems With Concrete - Click the first Honeycomb link, and from there, you can click the 'Next' URL to get to the Next page ...