The noise level in downtown Hoboken at night is highly specific to the street and the day of the week. On Thursday, Friday, and Saturday nights, the main corridors like Washington Street and First Street become quite loud with a dense mix of music from bars, loud conversations from crowds on the sidewalk, and traffic.
However, the sound diminishes very quickly as you move away from those main arteries. Just one or two blocks over on residential streets like Hudson, Bloomfield, or Garden, the atmosphere is much quieter. You might hear distant sirens or the occasional loud group walking by, but it is not a constant barrage of noise. Weeknights are a completely different experience; the entire downtown area is significantly calmer and more peaceful.