Portuguese (Brazil) · Pronunciation Guide
oo SEH-oo, said as one beat. Soft c, wide-open accented e, and a w glide.
A monosyllable, so the accent isn't placing stress — it's specifying the open vowel quality, which would otherwise be ambiguous. Portuguese accents short words for exactly this reason, as it does in "pé," "só" and "nós." The plural "céus" adds an s without changing anything else.
Listen: o céu
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Não tem uma nuvem no céu.
There isn't a cloud in the sky.
Listen: Não tem uma nuvem no céu.
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"Não tem uma nuvem no céu" is a double negative in the Portuguese sense — "não" plus "nem uma" collapsed into "uma." "Nuvem" ends in the nasal diphthong "vayng," and "no" is em fused with the article, so the sentence hums twice before landing on the open vowel of "céu."
Breaking it into two syllables — "SEH-oo" as two beats — is the standard error; it's one. Closing the vowel is the second, and reading the c as a k is the third. Spanish speakers reach for "cielo," which has an extra syllable and a completely different shape.