The weather may cause the fires to be more severe by having more dry conditions that adds fuel to the fire. Except for lightning, the fires are set by people or things like power lines. The vast majority of the fires would probably never exist if it wasn't for human intervention of some kind.
As warm as this month has been, it will be the first month this year that will be warmer than the same month last year, at Central Park. Of course Last year was a record warm year. Also this month will be warmer than last July by only a tenth or so.