My first son was born in late september. I hated being huge in the summer so much that I vowed it would never happen again! My second was born in the first week of june and this one will be born on 1st of May so I have escaped the hottest months.
With my 1st my feet and lower legs swelled up so much that none of my shoes fit. I had to buy slippers that were two sizes bigger and wear those in town!
What helped me was to get hubby to massage my feet at least twice a day! I normaly hate having my feet touched but they were so sore that it realy felt amazing!
I also used to sit on the couch with my feet higher than my head.
I often sat in the garden after dark with my feet in a bucket of cold water and after everyone was safely in bed I would open the front and back door for at least an hour to bring the tempriture of the house almost down to outside so that I could get some sleep. You need to sit in almost total darkness though or you will invite all the moths in!
Come to think of it, my neighbours probably thought I was the strangest person they had ever met! You'll do anything to keep cool though especially when your pregnant.