Korean · Pronunciation Guide
nal-sshi. The ㅆ is tensed and, because the vowel is ㅣ, also palatalized -- so it is a hard, hissing 'sh' rather than a plain s.
nalssi
Two blocks, the second slightly longer because a tensed sibilant takes time to produce. Nothing is stressed, but the word does have a noticeably light-front, heavy-back feel because of that consonant.
Listen: 날씨
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오늘 날씨가 어때요?
Oneul nalssiga eottaeyo?
How's the weather today?
Listen: 오늘 날씨가 어때요?
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오늘 날씨가 어때요? attaches the subject particle to a vowel-final noun, so nothing resyllabifies and 날씨가 runs as three clean beats. The question then closes with 어때요, which opens on another tensed consonant, ㄸ.
Learners produce a plain 'nal-si', missing both features at once -- squeeze the throat and let the tongue move back toward the palate. The dark English l is the other habit, and it colours the ㅏ backward, which makes the first block sound like 'nahl'.