@Cyclone I think the Codex of Creation makes it so the laws of physics apply. At most, the djinnis have control over these things alongside natural physics. Arcon, for instance, doesn't have djinnis (due to the Realta being very effective at immediately destroying them wherever they come about), but Arcon still has natural disasters and weather.
That part of the Codex falls under one of Zephyrion's two contributions (forces of Change and dynamism themselves), the other lesser contribution being his creating reactivity in gases. There's admittedly some overlap between Logos' physics and the idea of Change that Zeph added, but like the multiple types of magic I think this can coexist.
Anyways, what I am getting at is that Zephyrion made Change autonomous and almost mechanical. That way not every single entropic reaction must be willed to happen by Zeph. However, both he and the djinn can control this force, and so if djinn exist in an area then Change isn't just a mechanical and mindless force and things are not just left to mundane physics.
Edit: I realize that's wordy, so just think of djinn as an override. Yes, it's normal physics like on Earth and natural disasters could still happen if no djinn are around, but if they are, then the natural disasters and forces of nature aren't entirely natural. They're controlled by the local djinn.
Whether or not there are any djinn on Arcon hasn't been canonized because I've had nothing to do with the place. It could be that they exist in lesser states (after all, for every lord that you can see there's hundreds of almost invisible lesser djinn) but that the Realta ensure that there are no sentient lords.
