Need help identifying a bird? Please post your question here and if possible include a photo. Also let us know where and when you saw the bird. Other things that help are listing any field marks that stood out, behavioral information like how it walked, hopped or flew. This Forum is just for North American birds.
I was thinking Yellowthroat.
Nashville would be rare this time of year, also this bird has light legs which I thought ruled out Nashville, it doesn't rule out Mourning Warbler though... Which would also be rare at this time of year.
I'm still thinking Yellow-throat, but the distinct gray hood on the head is definitely off compared to the few Yellowthroats I've seen.
After looking through a lot of photos of immature Mourning, Nashville, and Yellowthroats, I think the Common Yellowthroat is the strongest contender. The Mourning has too much yellow on its breast, and the Nashville has black and yellow legs. I can't confidently answer with any of these birds, however.
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