Residents in the Philadelphia area should prepare for varying weather conditions over the weekend. While Friday and Saturday daytime hours are expected to be mostly dry, heavy rain and thunderstorms are likely Saturday night into Sunday morning. This could lead to localized flooding in some areas. Outdoor plans, including the Eagles' season opener on Sunday afternoon, may be affected if the weather does not clear as predicted. However, Monday is expected to bring drier and cooler conditions, providing some relief.