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Oggi fa molto caldo.
It's very hot today.
Having a high temperature; warm or hot.
Il caffè è troppo caldo per berlo.
The coffee is too hot to drink.
Mi piace il clima caldo.
I like the hot climate.
Can refer to both weather and temperature of objects.
A soup or broth, especially in Italian cuisine.
Ho preparato un buon caldo di pollo.
I made a good chicken soup.
In this sense, it is a noun.
Use 'caldo' for both weather and objects, but for weather, it's often paired with 'fa' (e.g., 'fa caldo').
Remember that 'caldo' can be both an adjective (hot) and a noun (soup). Context will clarify the meaning.
From Latin 'calidus', meaning 'warm'.
When referring to weather, it is often used with 'fa' (e.g., 'fa caldo'). As a noun, it refers to a type of soup.