The Lithuanian subdialect of Pelesa is located in the southern area of the Southern High Lithuanian (Aukstaitian) dialect (Voronovo district, Grodno oblast, Belarus). This paper deals with the acoustic features of the allophones in connected speech, and their relationship with the stress and with the adjacent consonants in this subdialect. A common characteristic of all vowels of the subdialect is their fronting after palatal consonants and their velarization if preceded by back ones. In connected speech the unstressed variants of vowels are more close than the stressed ones. An exception is less close variants - they become more open in unstressed position. Besides, the unstressed close non-labial vowels are pronounced more back (more close vowels - less back, and more open ones - more back). The unstressed open vowels are pronounced more fronted. The corresponding labial vowels are fronted only slightly; at the same time they are less labialized.