How many Mondays are in 2025?
There are 52 Mondays in 2025. The result can surprise people who expect every weekday to occur 53 times in a 365-day year, but only Wednesday receives the extra occurrence.
The reason is straightforward: 1 January 2025 was a Wednesday. A common year contains 52 complete weeks and one remaining day, and that leftover day is Wednesday. For Australian planners, this matters because a Monday can still be a public holiday, a working day or a family deadline even though it appears 52 times on the calendar.
Why Mondays total 52
Calendar arithmetic starts with the Gregorian calendar’s rules for leap years. A year divisible by four is normally a leap year, except for century years that are not divisible by 400. As 2025 is not divisible by four, February has 28 days and the year contains 365 days.
Dividing 365 into seven-day blocks leaves a remainder of one because 52 weeks contain 364 days. Every Monday therefore appears once in each complete week, giving 52 occurrences, while the extra day cannot create a 53rd Monday unless it falls on a Monday.
The first day of the year identifies that extra weekday. Since Wednesday, 1 January, begins the year, Wednesday appears 53 times. Mondays remain evenly distributed at 52, with no variation caused by leap-day rules.
A month-by-month check confirms the result. March, June, September and December each contain five Mondays, while the other eight months each contain four. That produces 20 Monday dates in the five-Monday months and 32 in the four-Monday months, for 52 altogether.
How the monthly pattern changes
Monthly totals depend on two things: the number of days and the weekday on which the month begins. A 28-day month has exactly four of every weekday. A 30- or 31-day month has four of each weekday, with the first three weekdays repeated five times. For example, March 2025 starts on a Saturday, so its five Mondays fall on 3, 10, 17, 24 and 31 March.
The same rule explains why June has five Mondays despite having only 30 days. June begins on Sunday, making Sunday, Monday and Tuesday the three weekdays that occur five times. September and December also begin on Monday, so both gain a fifth Monday at the end of the month.
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A month-by-month date comparison
The following comparison lists the first and last Monday in every month, together with the number available for scheduling:
| Month | Number of Mondays | First Monday | Last Monday |
|---|---|---|---|
| January | 4 | 6 January | 27 January |
| February | 4 | 3 February | 24 February |
| March | 5 | 3 March | 31 March |
| April | 4 | 7 April | 28 April |
| May | 4 | 5 May | 26 May |
| June | 5 | 2 June | 30 June |
| July | 4 | 7 July | 28 July |
| August | 4 | 4 August | 25 August |
| September | 5 | 1 September | 29 September |
| October | 4 | 6 October | 27 October |
| November | 4 | 3 November | 24 November |
| December | 5 | 1 December | 29 December |
| Year | 52 | — | — |
Adding the monthly counts confirms the annual total. The four months with five Mondays are March, June, September and December; February still has four because 2025 is not a leap year. Dividing by seven and rounding down also produces the correct result in this instance.
Counting with a fixed weekly interval offers an independent check. From 6 January to 29 December there are 51 intervals of seven days, which creates 52 Monday dates. The final December Monday is 29 December, one day before New Year’s Eve.
Confirming the result by date
Start with a known Monday, such as 6 January, and repeatedly add seven days. The sequence moves through January’s four Mondays before reaching 3 February, then continues without skipping or duplicating a date. This method is reliable because a Gregorian week always contains the same seven days.
For a quick cross-check, HowManyDaysIn.com offers date calculation tools that confirm weekdays, elapsed days and date differences. These tools are particularly helpful when a project starts on a Monday but finishes in another month.
Keep the counting convention in view when using elapsed-day results. If Monday and Friday are both counted, the span covers five calendar dates; if the starting date is excluded, it represents four elapsed days. The same care is needed for business-day calculations around weekends and public holidays.
Make the 2025 Mondays work
Australian workplaces do not always follow a Monday-to-Friday rhythm. Under the Fair Work Act 2009, full-time employees generally work no more than 38 ordinary hours per week, but a five-day roster can begin on another day. Shift workers, hospitality teams and regional employers may treat Monday as part of the weekend, making the 52 calendar Mondays more valuable as time away than as ordinary office days.
Public holidays can also change the practical meaning of a Monday. Australia Day fell on Sunday, 26 January 2025, and Monday, 27 January was the observed public holiday in most states and territories, including New South Wales and Victoria. The NSW Public Holidays Act 2010 sets the observance rules. Sydney offices, school routines and transport journeys can therefore feel different on that first Monday, even though it remains one of the year’s 52.
Weekend trading laws shape local habits as well. The Sunday Trading Act 1982 in NSW and the Sunday Trading Act 1983 in South Australia govern when many shops may open on Sundays. Coles and Woolworths supermarkets normally trade all seven days, so Saturday shopping remains familiar in Melbourne, Brisbane, Adelaide, Perth and Hobart, while some households settle their weekly groceries on Monday after work.
Save the monthly Monday dates now, mark public holidays and rostered days, and reserve the remaining Mondays for appointments that deserve an uninterrupted week. The verified count is 52, and planning from that number prevents a fifth Monday from being overlooked in March, June, September or December.