August 21 Zodiac Sign
Tradition: Western astrology. A tradition, not a forecast. Astrologers read it this way; the evidence does not.
By Suraj Giri
August 21 is Leo on the dates most calendars use (July 23 to August 22). From 1950 to 2029, every birth hour on August 21 in US Eastern time fell in Leo.
August 21 zodiac compatibility
By this site's zodiac points method, an August 21 Leo scores highest with Aries and Sagittarius, a strong match at 8 of 8 points, then Gemini and Libra, a good match at 5 of 8.
| Pair | Verdict | Points | Aspect |
|---|---|---|---|
| Aries and Leo | strong match | 8 of 8 | trine |
| Leo and Sagittarius | strong match | 8 of 8 | trine |
| Gemini and Leo | good match | 5 of 8 | sextile |
| Leo and Libra | good match | 5 of 8 | sextile |
Have your partner's birthday? Compare August 21 with your partner's birthday.
Scores come from this site's zodiac points method (formula 1.1), reviewed by Jahben R., astrologer, on 2026-09-23. How it works is on the methodology page.
Leo at a glance for an August 21 birthday
- Element: fire
- Modality: fixed
- Ruler: the Sun
- Position: day 30 of 31 of Leo
- Next sign: Virgo, from August 23
- The Sun, 1950 to 2029 (US Eastern time): 27.3 to 29.6 degrees of Leo
August 21 decan (Tradition)
In the triplicity system of decans, a tradition, August 21 falls in the third decan of Leo (20 to 30 degrees), ruled by Mars.
The older Chaldean system of decans assigns different rulers.
Famous people born on August 21
- Usain Bolt, sprinter, born 1986
- Robert Lewandowski, footballer, born 1988
- Mohammed VI of Morocco, monarch, born 1963
- Sergey Brin, computer scientist, born 1973
- Stephen Hillenburg, animator, born 1961
Birth dates from Wikidata (CC0), fetched 2026-09-26.
A note on August 21 birthdays
Almost at the end of Leo, this birthday sits at day 30 of 31, between 27.3 and 29.6 degrees. Aries and Sagittarius keep the top spot among Leo's matches by this site's scoring, each an 8 point trine, while Gemini and Libra sit at a 5 point sextile. The day that follows, August 22, splits between Leo and Virgo, the first hint that this sign is closing.
Questions people ask
What zodiac sign is August 21?
Who is an August 21 Leo most compatible with?
Does the birth year change the zodiac sign for August 21?
Birthdays around August 21
- August 20, Leo
- August 22, Leo or Virgo
- All August birthdays
Sources
- astronomy-engine 2.1.19: the Sun's position; the methodology page records its check against NASA JPL Horizons, and the build checks it against published equinox and solstice times
- This site's zodiac points method: formula 1.1
- Wikidata (CC0): birth dates, fetched 2026-09-26