What Day: September 15
Find the day of the week for any date of the year.
September 15 this year (2026) falls on a Tuesday. It's day 258 of the year, with 107 days left afterward, sits in Q3 (Fall), and falls under the zodiac sign Virgo in Western astrology. Because of how leap years shift the calendar, a date's day-of-week doesn't repeat on a fixed yearly schedule. September 15 will next fall on a Tuesday again in 2037. Within September, this is day 15 of 30, roughly 50% through the month. Overall, that's roughly 71% of the way through the year.
As of October 1, 2026, 12:19 PM (America/New York).
A Decade Ago
September 15, 2016 fell on a Thursday, a useful reference point if you're comparing how a recurring event has shifted across the week over the years.
Half a Year Away
Roughly six months from September 15 is March 15, which falls in spring and lands on a Sunday this year.
Nearby Dates
Check the day of the week for the date just before or after September 15 using the links below.