What's the temperature?
Kion wa dono kurai desu ka.
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
which; what (way)
approximately; about; around; or so; to (about) the extent that; (almost) enough that; so ... that ...; at least; as ... as ...; like
indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way