Good luck! We too are WAY over budget for June. Excited that July is a new month. Hopefully when you show him the evidence of where money has disappeared it will help. I did this with my DH once. I take care of all the money management and he just didn't understand where it was going and why and didn't understand at the time why every dollar was important. So I sat down and showed him exactly what the deal was and it really helped a lot. He told me it made a huge difference in his understanding of what was going on instead of me just saying "Don't spend any money!!" which is what I always used to do.
Now, every so often (like after last month which was really expensive for us) I make sure he understands where we are and what I am trying to work on right now. It keeps him in the loop and makes sure that we are on the same page. Hopefully when you show your DH the evidence, it will start to make an impact. Hard to avoid details that are in black and white! And then maybe it won't just seem like you are nagging him over it (that's what my DH felt I think).
Good luck!! Hopefully July is better!