Today, August 18, 2025, is not a major Catholic feast or holy day of obligation. In the Roman Catholic liturgical calendar, it is observed as Monday of the Twentieth Week in Ordinary Time. The day is part of Ordinary Time, which is the period outside the major liturgical seasons like Advent, Christmas, Lent, and Easter. Additionally, the saint most commonly commemorated today is St. Helena , mother of Emperor Constantine the Great and an important figure in early Christian history. Some calendars also remember St. Agapitus , a martyr from the third century.
There are no special obligations for Catholics on this date beyond the usual daily Mass readings and prayers.
