Consonants

• /p/ can also occur as affricated [pɸ] when in syllable-initial positions.
• Affricate sounds /tʃ dʒ/ can also be heard as palatal stops [c ɟ].
• Voiced stops /b d dʒ ɡ/ may also occur glottalized as implosives [ɓ ɗ ʄ ɠ] when in syllable-initial positions. In syllable-final position, they are realized as unreleased.
• /k/ is realized as a uvular stop [q] when occurring in between vowels /a ɔ o/. When it is preceded and followed by back vowels, it is then lenited and heard as the following sounds [χ], [ʁ] or [ʀ].
• /s/ is in free variation with [θ]. These sounds are voiceless at the end of a syllable. When syllable-initial, they are instead voiced, often with a voiceless onset: [sz] or [(θ)ð].
• /ŋ/ is often realized as lengthening of the previous vowel when following /o/ at the end of a word.
• Before voiceless vowels that precede a pause, consonants are de-voiced and plosives are aspirated.^[3]

Vowels

There is a phonemic distinction with voiceless vowels, which only occur word-finally, and which are only realized as voiceless before a pause:

Turkana features advanced tongue root vowel harmony.^[3] The vowels /i e o u/ and their voiceless counterparts are produced with an advanced tongue root, while /ɪ ɛ a ɔ ʊ/ and their voiceless counterparts are produced with a retracted tongue root. The advanced tongue root vowels are usually somewhat breathy in terms of voice. In most circumstances, vowels in any given word must either be all advanced or all retracted in their tongue root position. An exception is made for vowels that come after /a/, which can be either advanced or retracted (while vowels coming before /a/ must be retracted). In parallel to this, vowels following the semivowels /j/ and /w/ can be either advanced or retracted, but vowels preceding them must be advanced. However, the semivowels and /a/ do not affect each other: either may occur before the other, despite conflicting in their tongue root position.

Vowel harmony is usually controlled by the root of a word, so that the vowels of other morphemes assimilate to the root vowels' tongue root position. However, some suffixes are "strong" and instead assimilate the root along with any preceding suffixes. Prefixes are always weak and do not control other vowels. The vowels paired in such assimilations are /i/ vs. /ɪ/, /e/ vs. /ɛ/, /o/ (from earlier /ə/) vs. /a/, /o/ vs. /ɔ/, and /u/ vs. /ʊ/; either element of each pair will turn into the other to match the tongue root position of the controlling morpheme. Vowel harmony does not cross word boundaries, and a phonological word can be defined as a unit across which harmony operates. Vowel harmony is also blocked at the boundary between roots in a compound.

Long vowels occur phonetically, but are best analyzed as sequences of short vowels rather than phonemes in their own right. In roots, /ɔ/ and /ɛ/ may be realized as [wa] and [ja], respectively. High front vowels are deleted between a palatal consonant and another vowel. Voiceless vowels before a pause are lost after glides and nasals (after de-voicing them). Nonhigh voiceless vowels before a pause are furthermore often lost in general.

Tone

Turkana has two tonemes, high and low, and one or the other is carried by every vowel. Most syllables carry a high tone, so that low tone is more marked. Some tones are "floating" and not carried by a syllable at all. Minimal pairs for tone are rare, and so it is not important in distinguishing words, but it is used to distinguish verb tenses and noun cases, so that it is important in terms of grammar.