Japanese · Pronunciation Guide
te-n-ki, three beats — the nasal in the middle is a full beat and comes out as "ng" before the k.
tenki
Three slots, one with no vowel in it. English reads two syllables and delivers two beats, cutting the word by a third. The middle nasal is doing real timing work here, not just linking the two audible syllables.
Listen: 天気
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明日の天気はどうですか。
Ashita no tenki wa dou desu ka?
What's the weather like tomorrow?
Listen: 明日の天気はどうですか。
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明日の天気はどうですか contains 明日 (a-shi-ta) with its devoicing-prone middle vowel, and どう with a long o held for two counts. So within one question you have a whispered mora, a nasal mora and a doubled vowel — three separate ways Japanese uses beats that English wouldn't count.
"TEN-kee" in two syllables is the standard version, with the n treated as a syllable-closing consonant and a long stressed first vowel. Hum the nasal for its own beat, make it the velar "ng" variety since a k follows, and keep both vowels short — English "key" is roughly twice the length of the Japanese ki.