!TIL Spanish has good phonetic rules so Espeak (text to speech) is easier to understand. $ espeak -ves "Hola mundo ". I have set it to say good morning on Monday with $ crontab -e

00 8 * * 1 espeak -ves " Hoy es Lunes son las ocho! Que lo pases bien en el colegio. "

I don't know if it will do entonation of ¿? and ¡!.