September 2031 Calendar
Print a September 2031 calendar for the start of the school year and of autumn. September 2031 starts on a Monday and ends on a Tuesday; its 30 days fit in 5 week rows with either week start. Labor Day, the month’s only US federal holiday, falls on the 1st itself: Monday 1 September under federal law (5 U.S.C. 6103), so the long weekend runs from Saturday 30 August to Monday 1 September. The US Office of Personnel Management has not yet published its 2031 schedule. Rosh Hashanah begins at sundown on Wednesday 17 September and Yom Kippur at sundown on Friday 26 September. The September equinox, the start of autumn in the Northern Hemisphere, is Tuesday 23 September at 05:15 UTC (1:15 am in US Eastern time, but still Monday 22 September, 10:15 pm, in US Pacific). The month has two full moons, on 1 and 30 September. GOV.UK has not yet published the UK bank holidays for 2031, so the UK options say so rather than guess. Choose Classic, Bold, our own apple-orchard artwork, or a planner with goals, a to-do list and notes; add moon phases, week numbers and your own events; download a PDF in US Letter, A4 or A3, a PNG or SVG, or a phone or desktop wallpaper.
100% private — everything runs in your browser. Your events and settings stay in this browser; the PDF and images are made on your device.
Month and design
Your events
One per line: 2031-09-12 Dentist 3pm, Sep 20 Book club, 2031-09-08 to 2031-09-10 Trip. End a line with a colour like #16a34a. Your list stays in this browser.
Page and style
Planner headings
Everything runs in your browser: nothing you type is uploaded, and your settings autosave only in this browser. Holidays: US federal days are calculated with their observed weekdays and named as on the US Office of Personnel Management schedules (OPM lists years to 2030; 2031 and later follow the same rules in 5 U.S.C. 6103); Inauguration Day follows 5 U.S.C. 6103(c) and is marked as an observance; US daylight saving time follows 15 U.S.C. §260a; UK clock changes are from GOV.UK (its table to 2028, then the rule it states: the last Sunday in March and October); UK bank holidays are the GOV.UK list for 2026–2028 (GOV.UK has not yet published 2029, 2030 or 2031); Jewish holiday dates (including Purim) are from Hebcal; Islamic dates (Ramadan, Eid al-Fitr, Eid al-Adha, Islamic New Year) are the Umm al-Qura calendar’s for 2026–2031, marked “expected” because local dates follow the moon sighting and can be a day later; Lunar New Year dates are from the Hong Kong Observatory tables; Easter is calculated with the Gregorian computus and matches the US Naval Observatory’s method (Oudin) for every year from 1900 to 2200. Moon phases are calculated in your browser and match the US Naval Observatory table within a minute for 2026–2031; solstice and equinox times are the US Naval Observatory’s for 2026–2031. PDF export uses jsPDF and svg2pdf.js (MIT licence); print at 100% (actual size).
How to print a September 2031 calendar
- The calendar opens on September 2031 with US holidays, observances and moon phases.
- Pick a design: Classic, Bold, Seasonal art (an apple orchard at harvest with a basket of apples) or Planner with notes.
- Set the week start and week numbers; choose the time zone for the moon phase dates, or switch Holidays to a UK option.
- Type your own dates in “Your events”, e.g. “2031-08-30 to 2031-09-01 Labor Day trip”.
- Choose US Letter, A4 or A3 and portrait or landscape, then download the PDF and print at 100% (Actual size).
What you can use it for
- A September page for the fridge, desk or classroom
- School start, sports and club dates
- Labor Day weekend plans
- A phone or desktop wallpaper for September
- An A3 wall planner
September 2031 at a glance
| September 2031 | |
|---|---|
| Starts on | Monday |
| Ends on | Tuesday |
| Days | 30 |
| Weekdays (Mon–Fri) | 22 |
| Working days after Labor Day | 21 |
| Weekend days | 8 |
| ISO week numbers | 36, 37, 38, 39, 40 |
| Week rows (Sunday / Monday start) | 5 / 5 |
Weekdays are Monday to Friday. Working days subtract Labor Day (Monday 1 September), the only federal holiday in September 2031.
Holidays and observances in September 2031
| Date | Day | Holiday | Type |
|---|---|---|---|
| Sep 1 | Monday | Labor Day | Federal holiday |
| Sep 17 | Wednesday | Rosh Hashanah begins at sundown | Observance |
| Sep 23 | Tuesday | Autumn equinox | Observance |
| Sep 26 | Friday | Yom Kippur begins at sundown | Observance |
UK sets: GOV.UK has not yet published bank holidays for 2031. England and Wales, Scotland and Northern Ireland show no bank holiday for 2031 until it does; with Observances ticked they show Rosh Hashanah, the equinox and Yom Kippur.
None of the Islamic dates the calendar marks (the start of Ramadan, Eid al-Fitr, Eid al-Adha and the Islamic New Year) falls in September 2031: in the Umm al-Qura calendar September 2031 is in the months of Jumada al-Ula and Jumada al-Akhirah 1453; Eid al-Adha was expected on 2 April, the Islamic New Year on 23 April, and Ramadan is expected to begin on 15 December 2031.
Sources: federal law, 5 U.S.C. 6103 (the US Office of Personnel Management has not yet published its 2031 holiday schedule; holiday names as in the law and on OPM’s schedules), Hebcal for Rosh Hashanah and Yom Kippur, the US Naval Observatory for the equinox and moon phases, the Umm al-Qura calendar for the Islamic dates, and the GOV.UK bank holidays list.
Labor Day weekend 2031
| Date | |
|---|---|
| Saturday | 30 August |
| Sunday | 31 August |
| Labor Day (federal holiday) | Monday 1 September |
Labor Day is always the first Monday in September. In 2031 that is the 1st itself, so the long weekend starts in August and the month opens with a holiday.
Autumn equinox 2031
| Time zone | September equinox |
|---|---|
| UTC | Tuesday 23 September, 05:15 |
| US Eastern (EDT) | Tuesday 23 September, 01:15 |
| US Pacific (PDT) | Monday 22 September, 22:15 |
| UK (BST) | Tuesday 23 September, 06:15 |
| Japan (JST) | Tuesday 23 September, 14:15 |
The equinox is on the 23rd in UTC, US Eastern, UK and Japanese time, but on the evening of 22 September in US Pacific (and Hawaii). Pick a zone under “Moon phase dates for” and the calendar puts the equinox and the moon phases on the right date for it.
Moon phases in September 2031
| UTC | US Eastern | US Pacific | |
|---|---|---|---|
| Full moon | Sep 1, 09:20 | Sep 1, 05:20 | Sep 1, 02:20 |
| Last quarter | Sep 8, 16:14 | Sep 8, 12:14 | Sep 8, 09:14 |
| New moon | Sep 16, 18:47 | Sep 16, 14:47 | Sep 16, 11:47 |
| First quarter | Sep 24, 01:20 | Sep 23, 21:20 | Sep 23, 18:20 |
| Full moon | Sep 30, 18:58 | Sep 30, 14:58 | Sep 30, 11:58 |
Moon phase times are the US Naval Observatory’s, converted to each time zone. The tool calculates the phases in your browser (within a minute of the USNO table) and puts each one on the date it falls in the time zone you choose under “Moon phase dates for”.
September 2031 has two full moons, on the 1st and the 30th, in UTC and US time. The first quarter (01:20 UTC on 24 September) is on the evening of 23 September in US time zones.
Designs
| Design | What it looks like |
|---|---|
| Classic | Grey grid, coloured weekday bar, weekends shaded: the most ink-friendly |
| Bold | A coloured title band with the mini months in white and larger day numbers |
| Seasonal art | Our own drawing across the top: an apple orchard at harvest with a basket of apples and the first leaves turning |
| Planner with notes | The grid plus Goals, a To do checklist and Notes: beside the grid in landscape, under it in portrait |
The designs are our own drawings: you may use them and anything you make with them, including things you sell, with no credit needed.
Paper and screen sizes
| Size | Dimensions | Formats |
|---|---|---|
| US Letter | 215.9 × 279.4 mm | Portrait or landscape, PDF / PNG / SVG |
| A4 | 210 × 297 mm | Portrait or landscape, PDF / PNG / SVG |
| A3 | 297 × 420 mm | Portrait or landscape, PDF / PNG / SVG |
| Phone wallpaper | 1080 × 2340 px | PNG |
| Desktop wallpaper | 1920 × 1080 px | PNG |
PDF pages are made at these exact sizes. Print at 100% or “Actual size”, not “Fit to page”.
More for September
- Back to class: Teacher Planner and Lesson Plan Template.
- A timetable for the new term: Class Schedule Template.
- Every month of 2027 in one file: 2027 Monthly Calendar.
- Any month of any year, with photos: Calendar Maker.
More free calendars and planners
Planning ahead?
Calendars, planners and trackers you can print at home: free, private, no sign-up.
See all free tools →Frequently asked questions
What day does September 2031 start on?
September 2031 starts on a Monday and ends on a Tuesday. It has 30 days: 22 weekdays and 8 weekend days, in 5 week rows whether the week starts on Sunday or Monday.
When is Labor Day 2031?
Monday 1 September 2031. Labor Day is a US federal holiday on the first Monday in September under federal law (5 U.S.C. 6103), so Saturday 30 August to Monday 1 September is a three-day weekend for many. It is always a Monday, so there is never a separate observed day.
When is Rosh Hashanah 2031?
Rosh Hashanah 2031 begins at sundown on Wednesday 17 September; the first day is Thursday 18 September and the second Friday 19 September, per Hebcal.
When is Yom Kippur 2031?
Yom Kippur 2031 begins at sundown on Friday 26 September, and the day itself is Saturday 27 September, per Hebcal. Sukkot follows at sundown on Wednesday 1 October.
When is the fall equinox 2031?
Tuesday 23 September 2031 at 05:15 UTC, per the US Naval Observatory: 1:15 am on the 23rd in US Eastern time, but 10:15 pm on Monday 22 September in US Pacific. It is the first day of autumn in the Northern Hemisphere; pick your zone under “Moon phase dates for” and the calendar puts it on the right day.
Are there two full moons in September 2031?
Yes. The Moon is full on 1 September at 09:20 UTC and again on 30 September at 18:58 UTC, per the US Naval Observatory; both fall on the same dates in US Eastern and US Pacific time. A second full moon in one calendar month is often called a blue moon. In Japan the second one is already 1 October.
How many working days are in September 2031?
22 weekdays, or 21 working days after Labor Day.
Is Ramadan or Eid in September 2031?
No. In the Umm al-Qura calendar September 2031 is in the months of Jumada al-Ula and Jumada al-Akhirah 1453. Eid al-Adha 2031 was expected on 2 April and the Islamic New Year on 23 April, and Ramadan is expected to begin on 15 December 2031.
Are there bank holidays in September 2031 in the UK?
GOV.UK has not published the 2031 bank holidays yet; its list currently ends in December 2028. The calendar shows no UK bank holidays for 2031 rather than guessing, and says so at the foot of the page.
Is my information uploaded?
No. Your events and settings stay in this browser, and the PDF and images are made on your device.