What Zodiac Sign Do I Have? if I was born 18 December If you were born on 18 December then you are a Sagittarius Please select your date of birth to get your exact age Month January February March April May June July August September October November December Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 If I was born 18 December then what zodiac sign am I?