September 2025 starts on a Monday and has 30 days.
– 2025 September Calendar Printable (US)
Federal Holiday September 2025 (US)
– September 1, 2025 (Monday): Labor Day (observed in the United States)
September 2025 (US) Notable Dates
– September 23, 2025 (Tuesday): Autumnal Equinox (first day of Fall in the Northern Hemisphere)
Week Overview
– Week 1: September 1 – September 7 (Monday – Sunday)
– Week 2: September 8 – September 14 (Monday – Sunday)
– Week 3: September 15 – September 21 (Monday – Sunday)
– Week 4: September 22 – September 28 (Monday – Sunday)
– Week 5: September 29 – September 30 (Monday – Tuesday)
This month has four full weeks and one partial week at the end.