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September 2027 calendar

30 days22 weekdaysStarts on WednesdayISO weeks 35–39

September 2027
WkMonTueWedThuFriSatSun
35
36
37
38
39

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September 2027 in numbers

Days
30
Weekdays (Mon–Fri)
22
Weekend days
8
First and last day
Wednesday – Thursday
First and last working day
Wed, Sep 1 – Thu, Sep 30
Week numbers
35–39
Day of the year
244–273
Quarter
Q3 2027
Islamic months (computed)
Rabi' al-Awwal – Rabi' al-Thani 1449 AH

With 30 days, September 2027 has four full weeks plus 2 extra days, so Wednesday and Thursday occur five times; every other weekday occurs four times. It has 8 weekend days and 22 weekdays.

September 1 is day 244 of the year, so September 2027 covers day numbers 244 to 273. In the Umm al-Qura Islamic calendar, 1 Rabi' al-Thani 1449 AH falls on September 2 (computed; where months begin with the sighting of the new crescent, the start can differ by a day).

Public holidays in September 2027

DateHolidayWhere
Mon, Sep 6Labor DayUnited States (federal)
Mon, Sep 6Labour DayCanada (federal)
Thu, Sep 16The day following the Chinese Mid-Autumn FestivalHong Kong
Mon, Sep 20Respect for the Aged DayJapan
Thu, Sep 23Autumnal Equinox DayJapan
Fri, Sep 24Heritage DaySouth Africa
Mon, Sep 27King's BirthdayAustralia: Western Australia
Thu, Sep 30National Day for Truth and ReconciliationCanada (federal)

National holidays of the 17 sets we take from official government sources; see public holidays by country for regional days and sources. Where a holiday that falls on a weekend moves to a weekday, the table shows the day off.

Other dates in September 2027

Days that many people keep but that are not public holidays in our 17 sets, each from its fixed rule. Jewish dates begin at sunset the evening before; Islamic dates follow the Umm al-Qura calendar and are announced locally.

Clock changes and seasons

Clock changes from IANA tzdata as the rules stand today. Equinox and solstice times are the US Naval Observatory’s, in UTC.

Questions

How many weekdays are in September 2027?
22 weekdays (Monday to Friday) and 8 weekend days, out of 30 days. Public holidays are not subtracted, because they depend on the country; this month has 8 holiday dates in the countries we cover (see the table on this page).
What day does September 2027 start on?
September 2027 starts on Wednesday, September 1, 2027 and ends on Thursday, September 30, 2027. The first working day is Wed, Sep 1 and the last is Thu, Sep 30.
What week numbers are in September 2027?
Under ISO 8601 (weeks from Monday) September 2027 spans weeks 35–39. The week number page explains the rule.
What is the day number of September 1, 2027?
September 1 is day 244 of 2027 and September 30 is day 273. In the YYDDD format often called a Julian date, the month runs from 27244 to 27273.
What holidays are in September 2027?
Labor Day (Mon, Sep 6: United States (federal)); Labour Day (Mon, Sep 6: Canada (federal)); The day following the Chinese Mid-Autumn Festival (Thu, Sep 16: Hong Kong); Respect for the Aged Day (Mon, Sep 20: Japan); Autumnal Equinox Day (Thu, Sep 23: Japan); Heritage Day (Fri, Sep 24: South Africa); King's Birthday (Mon, Sep 27: Australia: Western Australia); National Day for Truth and Reconciliation (Thu, Sep 30: Canada (federal)).

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