In "I will be coming if this weather holds up", "I will be coming" is the apodosis and "this weather holds up" is the protasis.

1943 Dornford Yates An Eye for a Tooth
"If, after that, there is anything more to be done. . ."
"Yes?"
"You’d ----well better do it," said Forecast.
The meaning with which he invested this blunt apodosis was unmistakable. Even I, an eavesdropper, found it most sinister: and I was not surprised when, after a little silence, the other turned on his heel and led the way to the road.

1997 Angeliki Athanasiadou, René Dirven (eds) On Conditionals Again p. 309 by Hansjakob Seiler
There is furthermore the claim that conditionals necessarily involve a causal relation from protasis to apodosis. This may hold for the "conjunctive" types signalling a natural consequence from protasis to apodosis, but becomes increasingly unlikely as we approach disjunctive structures of the type. "May I perish most miserably, if I do not love Xanthia." does not mean "May I perish most miserably, because I do not love Xanthia."

Apodosis

Meaning

Noun

Antonyms