This paper discusses the semantics of two epistemic operators in Portuguese: the epistemic Future and modal verbs. The idea sustained in the literature for other languages that the epistemic Future has the same semantics as the modal verb (equivalent to) MUST does not account for the Portuguese data. The proposal is made that, though epistemic Future and epistemic modal verbs are devices to convey uncertainty, they operate on different grounds. Epistemic modal verbs are quantifiers over possible worlds, expressing a degree of epistemic commitment towards a proposition, while the epistemic Future is argued to be a mark signaling lack of evidence at the context of utterance. The other modal verbs of Portuguese, in their epistemic reading, are also considered, the proposal being made that Portuguese has also a modal verb that existentially quantifies over the set of Best worlds. This shows a very symmetric picture of Portuguese modal verbs: two of them select an ordered modal base and two others an unordered modal base; for each domain of quantification – the entire modal base or the set of Best Worlds (a subset of the modal base) – there will be an existential and a universal quantifier.