Interesting to note the varying responses to this one. For me also, Michael Quinion's entry did not provide an answer - just left me wondering whether the lineal connotations of "right" are a false trail.

I agree with the responses from my Antipodean brethren that it seems to be something we can lay claim to - the breaking of a drought - what could be more right! This seems supported by the OED's "14b" definition - that the phrase is now mainly in common use in Oz & Zild.

It was also interesting to note the date of the phrase was first documented (according to Quinion) - the late 19th century. Much earlier and I'd have had doubts, but this timing perhaps reflects Oz language and culture ("kulcha") reaching critical mass??

Has anyone considered the homophonic nature of the word "rain" in this context? What about, "It's as right as a rein on a horse" - subsequently shortened???

Or is this just a furphy??

stales