Exactly this!Any plans for tomorrow? Weather is supposed to be okay.
(Have you got) Any plans for tomorrow? (The) Weather is supposed to be okay.
Technically, without the bits in brackets, it's grammatically incorrect, but we often break rules in informal English. You need a question mark after first and full stop after the second. Unless you stick in a conjunction like 'because'. In that case, just a question mark right at the end. Options:
Any plans for tomorrow? Weather is supposed to be okay.
Any plans for tomorrow because the weather is supposed to be okay?
You trying to arrange a date with an attractive English teacher old bean?Okay clever edukated chaps.
Should you finish this sentence with a question mark, although it finishes with a statement.
Any plans for tomorrow, weather is supposed to be okay.
Indeed M'Lud, did try to coax a Nun for a quick punt at Iford Bridge but they're all booked up!You trying to arrange a date with an attractive English teacher old bean?
You devil!
My pleasure Rob, I knew sooner or later, I'd be of some use to somebody on here!Anyway, thanks for asking DJ. My daughter’s coming around for lunch so we’ll be indoors.
Addictive habit!Indeed M'Lud, did try to coax a Nun for a quick punt at Iford Bridge but they're all booked up!