Engine spark knock on warm dry day Mazda6 2006 V6

We are having some very dry Santa Ana weather here in San Diego this week, usually we have about 60% humidity but right now it’s about 10 I think. The air is very warm, perfect conditions for detonation. I just got done driving my car for about 40 minutes so the engine is really warm. Can really hear the spark knock today so I figured I would roll down the window and record it so you could hear it better. I can actually hear it with my headphones off. I need to do something about this soon.