Italian · Pronunciation Guide
KAHL-doh, stress on the first syllable, short and punchy. In IPA: /ˈkal.do/.
Two syllables, cal and do, weight on the first. The l is fully pronounced and clear, never softened or vocalized the way English l sometimes is at the end of a syllable.
Listen: caldo
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This word is close to fully phonetic once the l is handled correctly — English has a habit of letting syllable-final l go dark and vowel-like, and that habit needs to be dropped for Italian.
Fa molto caldo oggi.
It's very hot today.
Listen: Fa molto caldo oggi.
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"Fa caldo" is the standard Italian way to describe weather, built on the verb "fare" (to do/make) rather than "essere" (to be) the way English uses "it's hot" — literally "it makes hot." This impersonal "fa" construction covers most weather expressions ("fa freddo," "fa bel tempo") and is one of the clearest places Italian and English grammar simply don't line up word-for-word.
"Caldo" can also describe food or drinks ("un caffè caldo," a hot coffee) or a person's temperament, and as a noun on its own ("il caldo") it means "the heat," as in talking about a heat wave.
English speakers tend to pronounce the l in "cal-" with the back of the tongue raised, producing the "dark l" heard at the end of English "call" or "milk" — a muffled, vowel-like sound. Italian l is always the clearer, front-of-the-mouth "light l," heard in English "leaf," regardless of where it falls in the word.
The other slip is reaching for "è caldo" instead of "fa caldo" when talking about the weather, carried over directly from English "it's hot." Italian reserves "essere" for describing an object or person as hot ("il caffè è caldo") and uses "fare" specifically for ambient weather temperature.