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In,"Robi się późno"...why is the pronoun się used?

The verb “robi” without the pronoun “się” is used in the 3rd person singular to describe the activity that someone does or makes, for example: “On robi zadanie domowe” - “He is doing (his) homework”, “Ona robi zakupy” - “She is doing the shopping”, “On robi herbatę” - “He is making (a cup of) tea”. However, the verb “robi się” is used with the reference to a state or conditions the same as English construction “it’s getting”, that’s why you can say for example: “Robi się późno/ciemno/zimno” - “It’s getting late/dark/cold”.