Sao Tome and Principe — September 2026

Sao Tome and Principe businesses have 20 working days in September 2026 — that's 30 calendar days minus 8 weekend days and 2 weekday public holidays (Day off for Armed Forces' Day, Nationalization of the Roças). Northern-hemisphere autumn and Southern-hemisphere spring typically governs the work-rhythm in September; project deadlines and payroll cycles in Sao Tome and Principe should account for the holiday days listed above. September brings Labor Day in the US and Canada (first Monday) and the start of the Jewish High Holy Days in many years. For pay-period planning, September 2026 contains 4 full work-weeks plus 0 additional weekdays, useful when scheduling milestones or quarterly reviews. The working-day count above counts substitute days as a single deduction — it does not double-count when a public holiday falling on a weekend is moved to a Monday or Friday. Use this figure as the authoritative baseline for Sao Tome and Principe payroll-period calculations.