Classic monthly
One month per page with holidays, moon phases and notes.
Portrait
September 2031 Calendar
September 2031 calendar templates
4 styles in 4 colors (sage, mist blue, apricot and ink). Pick a color, then download a free PDF or PNG.
Monthly planner
Side column for goals, to-dos and notes.
Landscape
Bold monthly
Color band header, big readable dates.
Portrait
Minimal monthly
No grid lines, just dates.
Landscape
Holidays & observances in September 2031
- Mon, Sep 1Labor DayFederal holiday
Moon phases
- Full moon Tue, Sep 2
- Last quarter Tue, Sep 9
- New moon Wed, Sep 17
- First quarter Wed, Sep 24
About September 2031
- Days30
- Starts onMonday
- Ends onTuesday
- ISO weeks36–40
- Weekdays (Mon–Fri)22
- Working days after federal holidays21
This printable September 2031 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.
Calendar guides
Learn more about holidays, week numbers, moon phases and printing.
Calendar basics
Moon phases: how they work and when the full moons are
Why the Moon has phases, how long a lunar cycle lasts, traditional full moon names, and a list of full moon dates for the coming year.
Read guide · 2 min → HolidaysUS federal holidays explained
All 11 US federal holidays, how their dates are set, and the observed-day rule that moves weekend holidays to Friday or Monday — with a full table for the coming year.
Read guide · 2 min → Ideas12 practical ways to use a printable calendar
Ideas for getting more from a printable calendar: family planning, meal plans, habit tracking, chores, budgets, school terms, travel countdowns and more.
Read guide · 2 min →