August can be warmer than July, September can be warmer than August, September can be warmer than July, June can be warmer than July and August but when it comes to long term averages, I think you will find that July is warmer than August. I'm not aware of an occasion when the 30 year average for July was less than that of August. Maybe worth looking at but not in recent times, certainly not with the last three 30 year averages.