Tides and Temperature
- The Battery, New York Harbor: Shall We Swim Today? displays current tides and water temperature as well as mean temperatures going back more than 10 years.
- Sandy Hook, New York Harbor: See NOAA Sandy Hook Station
- Hudson River north of NYC: See NOAA Turkey Point Station
Water Quality
- NYC Waterbody Advisories: NYC DEP
Air Quality
- Current air quality data from a partnership of US government agencies: AirNow