The snow that arrived 8-9 days ago has disappeared from the Main Trail, but it exists in the lows and cracks around the boulders. So unless another storm comes, you will have a fine hike.

As for the weather on your particular hike day, it could be a quiet, sunny day, or it could be stormy. The storms are infrequent in September, so your chances are very good.

Keep an eye on the links on the Mt Whitney Weather page.