Chinese · Pronunciation Guide
tyen-CHEE: a high level first syllable with a strong puff of air, then a hard-falling second with another one.
tiānqì
Level into falling, with no sandhi. Both initials are aspirated, so this is a word with a lot of breath in it — unusual, since most two-syllable compounds mix an aspirated consonant with an unaspirated one. Producing both puffs without letting either one weaken is the technical demand.
Listen: 天气
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今天天气怎么样?
Jīntiān tiānqì zěnmeyàng?
What's the weather like today?
Listen: 今天天气怎么样?
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今天天气怎么样? repeats tiān twice in a row — the end of 今天 and the start of 天气 — so you get two identical level syllables back to back before qì drops. Then zěn dips, me fades, yàng plunges. Sustaining that double tiān at the same height, without letting the second sag, is the sentence's main difficulty.
Under-aspirating either syllable is the standard error: tiān becomes diān and qì becomes jì. Feel the air on your palm for both. The -ian final also opens out to "tyahn", and the q gets produced as an English "ch" with rounded lips and a retracted tongue when it should be forward with the lips spread.