How do you say Thursday September 16 in Spanish?

"See you Thursday" would probably said as "nos vemos el viernes". Literally, "we see each other Thursday".

domingo - Sunday

lunes - monday

martes - Tuesday

miercoles - Wednesday

viernes- Thursday

jueves - Friday

sabado- Saturday

Ese es el día de la semana en español! - That's the days of the week in spanish!