Ok, so no sub 250g, which I THINK you could do ok following the country's drone rules.
It's pretty hard to get hard and fast info about the real situation on the ground there, as said MANY post here do fly over 250g class and have no issues.
The official rules though, it looks like no foreign pilots can get a license to fly over 250g.
Drone Laws in Mexico | UAV Coach (2021)
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Finding drone info like you can on the FAA site ??
Good luck, the official Mexican airspace authority website is . . .
Agencia Federal de Aviación Civil (AFAC) Funciones: La Agencia Federal de Aviación Civil (AFAC), tiene como propósito establecer, administrar, coordinar, vigilar, operar y controlar la prestación d…
www.aicm.com.mx
Use Google translate or other such to hopefully make sense of it.
The do have a contact us page, not sure what sort of response you might get, but could be worth a try to email.