a bad spell of wether

[depaepet]

Does the expression ' a bad spell of wether' refer to the fact that someone has made a spelling mistake?

[Anglika]

Without context, that is not possible to say.

[Kätzchen]

I'm no teacher

I think it's simply a misapplication of "a spell of bad weather".

[konungursvia]

Yes, and in this case, "spell" means "period of time" or perhaps "report."

[Anglika]

That of course is the obvious answer. But the OP may have heard it in a particular context which might alter that assumption. As a phrase it is certainly not one in general use referring to a person having problems with spelling.

[Raymott]

Does the expression ' a bad spell of wether' refer to the fact that someone has made a spelling mistake?

I think it's an intentional pun on "bad spelling" and "weather/wether/whether".