You might look at the commentary of St. John Chrysostom, who is a 4th century Saint and Doctor of the Roman Catholic Church. He explains in his 22nd Homily on the the Gospel according to Matthew:
By evil here He means, not wickedness, far from it, but affliction,
and trouble, and calamities; much as in another place also He says, Is
there evil in a city, which the Lord has not done? nor any thing like
these, but the scourges which are borne from above. And again, I, says
He, make peace, and create evils: [Isaiah 45:7] For neither in this
place does He speak of wickedness, but of famines, and pestilences,
things accounted evil by most men: the generality being wont to call
these things evil. Thus, for example, the priests and prophets of
those five lordships, when having yoked the cattle to the ark, they
let them go without their calves, [1 Samuel 6:9] gave the name of evil
to those heaven-sent plagues, and the dismay and anguish which thereby
sprang up within them.
This then is His meaning here also, when He says, sufficient unto the
day is the evil thereof. For nothing so pains the soul, as carefulness
and anxiety. Thus did Paul also, when urging to celibacy, give
counsel, saying, I would have you without carefulness.
But when He says, the morrow shall take thought for itself, He says it
not, as though the day took thought for these things, but forasmuch as
He had to speak to a people somewhat imperfect, willing to make what
He says more expressive, He personifies the time, speaking unto them
according to the custom of the generality.