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September 2026 calendar

30 days22 weekdaysStarts on TuesdayISO weeks 36–40

September 2026
WkMonTueWedThuFriSatSun
36
37
38
39
40

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September 2026 in numbers

Days
30
Weekdays (Mon–Fri)
22
Weekend days
8
First and last day
Tuesday – Wednesday
First and last working day
Tue, Sep 1 – Wed, Sep 30
Week numbers
36–40
Day of the year
244–273
Quarter
Q3 2026
Islamic months (computed)
Rabi' al-Awwal – Rabi' al-Thani 1448 AH

With 30 days, September 2026 has four full weeks plus 2 extra days, so Tuesday and Wednesday 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 2026 covers day numbers 244 to 273. In the Umm al-Qura Islamic calendar, 1 Rabi' al-Thani 1448 AH falls on September 12 (computed; where months begin with the sighting of the new crescent, the start can differ by a day).

Public holidays in September 2026

DateHolidayWhere
Mon, Sep 7Labor DayUnited States (federal)
Mon, Sep 7Labour DayCanada (federal)
Mon, Sep 21Respect for the Aged DayJapan
Tue, Sep 22Citizens' HolidayJapan
Wed, Sep 23Autumnal Equinox DayJapan
Thu, Sep 24Heritage DaySouth Africa
Sat, Sep 26The day following the Chinese Mid-Autumn FestivalHong Kong
Mon, Sep 28King's BirthdayAustralia: Western Australia
Wed, 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 2026

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 2026?
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 9 holiday dates in the countries we cover (see the table on this page).
What day does September 2026 start on?
September 2026 starts on Tuesday, September 1, 2026 and ends on Wednesday, September 30, 2026. The first working day is Tue, Sep 1 and the last is Wed, Sep 30.
What week numbers are in September 2026?
Under ISO 8601 (weeks from Monday) September 2026 spans weeks 36–40. The week number page explains the rule.
What is the day number of September 1, 2026?
September 1 is day 244 of 2026 and September 30 is day 273. In the YYDDD format often called a Julian date, the month runs from 26244 to 26273.
What holidays are in September 2026?
Labor Day (Mon, Sep 7: United States (federal)); Labour Day (Mon, Sep 7: Canada (federal)); Respect for the Aged Day (Mon, Sep 21: Japan); Citizens' Holiday (Tue, Sep 22: Japan); Autumnal Equinox Day (Wed, Sep 23: Japan); Heritage Day (Thu, Sep 24: South Africa); The day following the Chinese Mid-Autumn Festival (Sat, Sep 26: Hong Kong); King's Birthday (Mon, Sep 28: Australia: Western Australia), and 1 more in the table above.

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