There isn't a consensus on this matter: it really depends on your particular stance and analysis that you choose to adopt.
Usually "mood" is a label for "the grammaticalisation of modality", where 'modality' means something like 'representation of an event in a non-factual way'-- i.e. your representation is 'coloured' with various notions, typically indicating some 'scale' of notions such as necessity, possibility, volition etc.
One immediate problem is that there's no clear-cut list of concepts that definitely must or must not complete this list, and it's not clear what semantically these notions really have in common other than "the types of things usually conveyed by modal verbs"-- i.e. our definitions are a little bit circular.
But accepting that, which category of modality is represented by a particular modal verb (or other construction) is really a matter of which particular framework you want to invent or subscribe to. However, a common broad categorisation would be to talk about:
- "epistemic necessity" when 'should' (and 'must', 'have to', 'is bound to' etc) are used to indicate the speaker's judgement/opinion of likelihood;
- "root necessity" when they are used to indicate the speaker's more objective assessment of whether, if you lile, 'the universe forces the event to be true'.
In this case, the speaker is essentially indicating their opinion, so you would probably refer to it as epistemic necessity.
There is another, broader, view of "mood" which simply looks at whether events are portrayed in a way that can be agreed with or denied. So for example, note that it is easy to use a 'tag'-based utterance to agree with the following statements:
It's raining. : Yes, it is.
It should rain later. : Yes, it should.
whereas that's not possible in these cases, as there's no real fact to "agree" with and we can't use the same procedure for forming a corresponding tag:
Let it rain!
Rain and see if I care!
(Of course, we could say "Yes, let it!" or "No, don't let it!" but these are different syntactic structures to the 'simple' tag, and we're not agreeing with the factual content of the utterance.)
So from this viewpoint, 'should' here doesn't indicate any special mood at all. Whereas in "let it..." and the simple imperative "rain!", we would be led to conclude that these are examples of a different mood.
So I repeat: there isn't a single answer to this question. It depends on what framework you choose to adopt and is quite a complex matter.
I leave it as an exercise to the reader to decide if this categorisation, and indeed the notion of "mood" at all as it is typically applied to English, really buys you terribly much.
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