| <-August 1966 | September 1966: | October 1966-> |
| Sunday: | Monday: | Tuesday: | Wednesday: | Thursday: | Friday: | Saturday: |
| 1: The 22nd Thursday in Ordinary Time | 2: The 22nd Friday in Ordinary Time | 3: The Memorial of Saint Gregory the Great, Pope and Doctor | 4: The 23rd Sunday in Ordinary Time | |||
| 5: The 23rd Monday in Ordinary Time | 6: The 23rd Tuesday in Ordinary Time | 7: The 23rd Wednesday in Ordinary Time | 8: The Birth of Mary | 9: The 23rd Friday in Ordinary Time | 10: The 23rd Saturday in Ordinary Time | 11: The 24th Sunday in Ordinary Time |
| 12: The 24th Monday in Ordinary Time | 13: The 24th Tuesday in Ordinary Time | 14: The Feast of The Triumph of the Cross | 15: The 24th Thursday in Ordinary Time | 16: The 24th Friday in Ordinary Time | 17: The 24th Saturday in Ordinary Time | 18: The 25th Sunday in Ordinary Time |
| 19: The 25th Monday in Ordinary Time | 20: The 25th Tuesday in Ordinary Time | 21: The Feast of Saint Matthew, Apostle and Evangelist | 22: The 25th Thursday in Ordinary Time | 23: The 25th Friday in Ordinary Time | 24: The 25th Saturday in Ordinary Time | 25: The 26th Sunday in Ordinary Time |
| 26: The 26th Monday in Ordinary Time | 27: The 26th Tuesday in Ordinary Time | 28: The 26th Wednesday in Ordinary Time | 29: The Feast of Michael, Gabriel and Raphael, Archangels | 30: The Memorial of Saint Jerome |