What does ～の為か mean in this sentence?


> ちょうど昼過ぎの為か、よく空いていた車内。

[According to Jisho.org](https://jisho.org/word/%E7%82%BA), 為 means "sake;
purpose", "consequence; result", "regarding, concerning", but I can't say what
meaning is in this sentence, and also I don't know what is the meaning of か in
this case. I know that [か can make a question as a relative
clause](https://japanese.stackexchange.com/questions/13034/usage-
of-%E3%81%8B-after-a-clause), but I'm not sure if it is the case here, and if
so, I don't understand the relationship of the first clause with か and the
following sentence.




If we remove か from the sentence we get 「ちょうど昼過ぎの為、よく空いていた車内。」'a car that was
very empty, because it was just after noon'. The か here removes some amount of
certainty, almost like saying ' _perhaps_ because it was just after noon'.




If we remove か from the sentence we get 「ちょうど昼過ぎの為、よく空いていた車内。」'a car that was
very empty, because it was just after noon'. The か here removes some amount of
certainty, almost like saying ' _perhaps_ because it was just after noon'.

