A long, long time ago we had an ATIS feed for JFK but that died.
I don't know of any other feed where you can get it online so your best bet is to call it or if you're close enough, use your scanner.
It's really nothing exciting, just something like this ...
"Kennedy airport information uniform one zero five zero zulu wind one zero zero and five, visibility one zero, sky clear below 12,000 temperature 10 dewpoint 8, altimeter 3004 arrivals expect vectors VOR DME Runway one three left runway one three right, departures expect runways four left, four right. Numerous cranes operating in vicinity of Kennedy airport, for noise abatement please use the assigned runways. Notify you have information Uniform"
That's off the top of my head so it might not be word for word how its one.