In Australia, P. weigeli is endemic to the Kimberley ranges.

[2] The preferred natural habitats of P. weigeli are forest and savanna.

[2] P. weigeli was genetically confirmed as a distinct species in 2017.

[4] Within the genus Pseudechis it is most closely related to the eastern dwarf mulga snake (P. pailsei) and an as yet undescribed species from the Northern Territory.

[4] The specific name, weigeli, is in honor of Australian herpetologist John Randall Weigel (born 1955).