Yeah, that forecast can be so wrong sometimes. I was reading something about how some guys just add a couple of 'bad weather' days to their schedule each month as a buffer. Like, they don't book those days solid, so when rain hits, they just slide everything over into those empty slots. Seems smart, but I guess you have to be busy enough to afford holding those days open. Might be worth trying.

Try a helicoil kit if the threads are salvageable.

That's so incredibly annoying every single time.

See this with a lot of modern tools. They save money but cause new problems. Your grout hardening too fast is a classic case.