translation - English equivalent of the Portuguese phrase: "this person's mood changes according to the moon"

In Portuguese there is an expression that says:

"Essa pessoa é de lua."

Literally "this person's mood changes according to the moon", which means that nobody can predict that person's mood.

Is there an equivalent expression or similar to this in English?

When someone is angry one day and very peaceful the next day...

Answer

Such a person is said to be mercurial or capricious.

mercurial: likely to change your mood or opinion unexpectedly

capricious: suddenly and unexpectedly changing your opinion or behaviour without any good reason

An equivalent expression might be, "He/she is as changeable as the weather."

Comments

Is there a word/phrase for "unperformant"?

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A man has a garden measuring 84 meters by 56 meters. He divides it into the minimum number of square plots. What is the length of the square plots?

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What warning does Chuchundra issue to Rikki?

Chuchundra, the sniveling, fearful muskrat who creeps around walls because he is too terrified to go into the center of a room, meets Rikki in the middle of the night. He insults Rikki by begging him not to kill him. He then insults him by suggesting that Nag might mistake Chuchundra for Rikki. He says, "Those who kill snakes get killed by snakes." He issues this warning to Rikki not to help keep Rikki safe but as a way of explaining why Rikki's presence gives him, Chuchundra, more reason to fear. Chuchundra starts to tell Rikki what Chua the rat told him--but breaks it off when he realizes he might be overheard by Nag. He says, "Nag is everywhere, Rikki-Tikki." Rikki threatens to bite Chuchundra to get him to talk. Even then, Chuchundra won't overtly reveal any information. But he does say, "Can't you hear, Rikki-Tikki?" This is enough of a clue for the clever mongoose. He listens carefully and can just make out the "faintest scratch-s...

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