Working Days in September 2025

September 2025 has 30 calendar days, of which 8 fall at the weekend. It opens on a Monday and closes on a Tuesday, and contains 5 Mondays — useful to know if your payroll or reporting cut-off lands on a particular weekday.

There are no bank holidays in September 2025in England & Wales, so the 22 working days are simply every weekday in the month. Scotland or Northern Ireland may still differ — check the cards above.

That is 1 more working day than September 2024, which had 21. The shift is down to which weekday the month starts on and whether a movable holiday like Easter lands inside it.

Across the year, September has the fourth-most working days of any month in 2025in England & Wales. All three UK regions share the same total of 22 working days this month.

For HR and payroll, the working-day count drives pro-rata pay for anyone starting or leaving part-way through September, and the number of Mondays affects weekly-paid staff and any cut-off tied to the start of the week. For project and finance teams, it sets the realistic capacity for the month before leave is even taken into account.

Working days are counted Monday to Friday, excluding the bank holidays shown above for the region you choose. Scotland and Northern Ireland carry extra holidays — Scotland’s 2nd January, St Andrew’s Day, and an early-August Summer holiday; Northern Ireland’s St Patrick’s Day and Battle of the Boyne — so a UK-wide team can have three different figures for the same month. Use the calculator below to count forwards or backwards from any date in September 2025.