Good question! Lots of weird fic draws in sf elements, of course, but yeah, especially if we take a Suvinian approach to sf emphasizing a “possible” novum rooted in realism, it’s exceedingly rare (not impossible!) for the author to then emphasize the unsettlement at the heart of the weird
To oversimplify: might most SF be a displacement in time [that promises a better/worse but stable reality], whereas the weird is a disruption at the heart of the symbolic order, the inability to make sense of (any) historical happening? In psychoanalytic terms, fantasy vs. psychosis.
I like that! I like the time-based def for SF although I might pick at “displacement” there - that would imply an affective weirdness that isn’t always there. Would be interesting to investigate that with/against the weird disruption…