matutinal

Of, occurring in, or relating to the morning, especially the early morning upon waking up.

1874, Henry James, "Professor Fargo" in The Galaxy 18(2) (August 1874): 233–253. [A] young lady was introduced who had come to request him to raise a ghost—a resolute young lady, with several ringlets and a huge ancestral umbrella, whose matutinal appetite for the supernatural had not been quenched by the raw autumnal storm.

'Top 'o the mornin' to ye!' he called to Flory in a hearty matutinal voice, putting on an Irish accent.

Active in the morning; waking up early.

Pen, putting on his hat, strode forth into the air, and almost over the body of the matutinal housemaid, who was rubbing the steps at the door.

Certain other plants agree with certain other kinds of birds in being peculiarly matutinal. Go out as early as we will, we find the delicate white bells of the wild convolvulus in the dewy hedge, […] just as we are never too soon for the chaffinch, the blackbird, and the lark.