Born on September 23: Zodiac Sign & Birthstone

Anyone born on September 23 is a Libra. The September 23 birthstone is Sapphire and the September 23 birth flower is the Aster. This is a boundary date, so in some birth years it falls under Virgo instead.

What it means to be born on September 23

A birthday on the 23rd of September falls under Libra. Libra is a cardinal air sign ruled by Venus, the only zodiac sign symbolized by an object, the scales, standing for balance, fairness and harmony. Tradition ties Libra to partnership and diplomacy. Libra season opens autumn.

September 23 sits on the Virgo and Libra boundary

This date is one of the twelve changeovers in the zodiac. A tropical sign begins at the moment the sun reaches a particular point, and that moment drifts by roughly six hours a year before a leap day pulls it back. On a boundary date the crossing can therefore land on either side of the calendar day, depending on the birth year and the time zone. Charts that publish fixed dates, including ours, round it.

In practice that means a birthday on September 23 is Libra in most years and Virgo in some. Only an ephemeris for the exact birth year and time settles it. The full list of boundaries is in the cusp guide.

What weekday September 23 falls on

A common year is 365 days, which is 52 weeks plus one day, so a birthday moves forward one weekday each year and two across a leap year. Over time it visits all seven. The next time September 23 falls at a weekend is 2028, on a Saturday.

The weekday September 23 falls on over the next ten years.
Year	Weekday	Weekend?
2026	Wednesday	no
2027	Thursday	no
2028	Saturday	yes
2029	Sunday	yes
2030	Monday	no
2031	Tuesday	no
2032	Thursday	no
2033	Friday	no
2034	Saturday	yes
2035	Sunday	yes

Your September 23 birthstone and flower

Because September 23 sits in September, your birthstone is Sapphire, a royal blue gem traditionally meaning wisdom, loyalty and nobility. Your birth flower is the Aster, which stands for wisdom, faith and valour. Together they make a natural birthday pairing for a card, gift or tattoo.

Every tradition tied to September 23

Everything the calendar assigns to September 23, in one table.
Field	Value
Zodiac sign	Libra (September 23 to October 22)
Element and modality	Cardinal Air
Ruling planet	Venus
Lucky colors	Blue and Lavender
Modern birthstone	Sapphire, royal blue
Other recognized stones	Lapis Lazuli (deep blue with gold flecks)
Birth flower	Aster, with Morning Glory as secondary
Day of the year	267 of 366 and 266 of 365
On a sign boundary	yes, shared with Virgo

Libra strengths and matches

Libra is often described as diplomatic, fair-minded and sociable. In the traditional element model, Libra matches most easily with Gemini, Aquarius and Leo. Those percentages come from a published formula you can check on the method page, not from a reading.

See the full birth profile

Want the shareable card for September 23? Open the birth profile tool, pick this date, and download a card to save or share. You can also read the full September overview, or browse every date we cover.

Frequently asked questions

What zodiac sign is September 23?

Anyone born on September 23 is a Libra, a cardinal air sign ruled by Venus. September 23 sits exactly on the boundary with Virgo, so for some birth years the answer is Virgo instead.

What is the birthstone for September 23?

The birthstone for September 23 is Sapphire, the September birthstone, which is royal blue. September also recognizes Lapis Lazuli.

What is the birth flower for September 23?

The birth flower for September 23 is the Aster, the September birth flower, with the Morning Glory as a secondary flower.

What day of the week does September 23 fall on?

In 2026 it falls on a Wednesday. Because a common year is 365 days, the weekday moves on by one each year and by two across a leap year, so it cycles through all seven over time. The table on this page lists the next ten years.

Where does September 23 fall in the year?

September 23 is day 267 of a leap year and day 266 of a common year.

Is September 23 on the cusp?

Yes. September 23 is a boundary date between Virgo and Libra. The sun does not cross the boundary at the same clock time each year, so a birthday here can belong to either sign depending on the birth year and time zone. Settling it needs an ephemeris, not a date table.

Born on September 23