What's the point of rolling the weather die on the first players starting turn since there are no tiles out it seems irrelevant. Am I missing something?
Yeah, you are missing the part where it says:
"Warning: weather comes into play during the second round of play. In the first round, players ignore this step and proceed directly to the next."
Rulebook Page 4
Section: Playing the Game
Sub-section: 1) Determine Weather Conditions
So not only does the first player skip rolling the weather die; all players skip rolling the weather die during the first round.