I found a brilliant forum that has all the info you need on bulgaria - they have a great discussion board and everyone is really helpful with any questions you have.
Hi i went last July and it was really hot but rained twice unfortunately, but my mum went the year before at the same time and it didn't rain at all!! Guaranteed to be in its 30's though I went to sunny beach and it was brill everything is sooo cheap as well we came back with most of our spends still!! Have a good hol!