The song of male Yucatan Nightjar is described as "a loud, clear puc ree-u-reeeu' or pc weeu wee-weeeu", given at a rate of 10/19-20 seconds; the first note is quiet, and is not always audible at a distance (Howell and Webb 1995).
For a representative audio recording with sonogram, see audio
This song also is described as "Ree-o-Ree, rising in intensity on the terminal vowel and the first and last syllables, and dropping abruptly on the middle syllable" (Paynter 1955). Paynter (1955) attributed this song to Yucatan Poorwill (Nyctiphrynus yucatanicus), a mistake that was followed by many subsequent authors, many of whom in turn attributed the song of Yucatan Poorwill to Yucatan Nightjar (e.g., Davis 1962). Vocalizations of these two nightjars were not clarified until Pierson (1986) assigned the songs of each to the correct species; see also Hardy and Straneck (1989).
Another vocalization of Yucatan Nightjar is a "hard, hollow clucking, k-lok k-lok ... or p-tok ..." (Howell and Webb 1995).