September 2025 Calendar
Holidays & observances in September 2025
- Mon, Sep 1Labor DayFederal holiday
Moon phases
- Full moon Mon, Sep 8
- Last quarter Mon, Sep 15
- New moon Mon, Sep 22
- First quarter Tue, Sep 30
About September 2025
- Days30
- Starts onMonday
- Ends onTuesday
- ISO weeks36–40
- Weekdays (Mon–Fri)22
- Working days after federal holidays21
This printable September 2025 calendar marks Labor Day, shows moon phases and includes a notes area. Use the options to start the week on Sunday or Monday, add ISO week numbers, or switch to the planner template with a to-do column.