In Act III, Scene 1, the only reference to time of day is that the day is "hot," suggesting it is the middle of the day. The heat of the sun is riling the tempers of the young men. Then in Act III, Scene 2, we hear Juliet wishing that night would come faster:
Gallop apace, you fiery-footed steeds,
Toward Phoebus' lodging. Such a wagoner
As Phaeton would whip you to the west
And bring in cloudy night immediately.
She wants the day to go by faster (saying "Come, civil night") so that she can be with Romeo, to whom she has been secretly married. The nurse agrees to help Romeo climb cords up to Juliet's chamber and ends the scene telling Juliet to go to bed (suggesting it is toward evening).
Hie to your chamber. I’ll find Romeo
To comfort you. I wot well where he is.
Hark ye, your Romeo will be here at night.
I’ll to him. He is hid at Lawrence' cell.
In Act 3, Scene 3 Romeo and the Friar discuss Romeo's banishment. We know it is not nightfall yet, as Romeo must be gone by that time. ...
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