How much are loitering tickets?
You should not have to pay anything, because you are obviously not in violation of that ordinance. Superman has given you the correct link, but has failed to read the ordinance carefully. This is not a truancy ordinance, it is a loitering ordinance (a truant who was not loitering would not violate it), but it is a “Daytime” ordinance, and it specifically applies only to loitering between the hours of 8:30 a.m. and 1:30 p.m. You cannot violate this law at 8 p.m., nor (as Superman notes) can you be convicted of a curfew violation. The officer who cited you either did not know the law, or was rousting you. Copy the ordinance at the link Superman gave you, underline the hours the ordinance is effective. When you go to court, plead not guilty and give the underlined copy to the hearing officer. EDIT: Superman–653g is now 653b. However that requires the adult definition of loitering–remaining at a school for an evil or sinister purpose (Mandel v. Muni Ct, 276 CA2d 649)–and also appears to
