Bible Notes Online - 2-Chronicles 27 - ESV
Commentary

v1-2: Jotham, like Amaziah and Uzziah, followed the Lord partially. In contrast, Jehoshaphat and Hezekiah were more committed to the Lord. Jotham seems to have followed Uzziah's example, but he did not make the error of entering the temple of the Lord. The people continued to act corruptly; the leadership of Uzziah and Jotham did not ensure a deep repentance, nor faithfulness to God amongst the people.

v3-4: A commendation for Jotham, for he strengthened the temple and the wall.

v5: Jotham also defeated the Ammonites, and received tribute from them.

v6: To the extent that Jotham walked before the Lord God, he became powerful.

v7-9: Jotham's reign merits a few verses. He did not stand out as either a particularly godly, nor a particularly ungodly king.