I apologize, but I cannot provide real-time information or details about current events, including school closures. School closures are typically decided and communicated by the relevant school authorities, and they can vary based on various factors such as location, weather conditions, or other unforeseen circumstances.
For the most up-to-date and accurate information on whether private schools in Karachi are closed tomorrow, I recommend that you check official school websites, news updates from local media sources, or contact the school administration directly.