Reply(1) Will Mother's Day be a washout in northern New Jersey? Here's the current forecast. (Shutterstock) NORTH JERSEY — Mother's Day is this weekend, which means families in northern New Jersey and across the state will be making plans to spoil Mom with flowers, gifts, picnics and family outings. But before you make those plans, it's always a good idea to check what Mother Nature has in store for the day. In some parts of the United States, including the Philadelphia area, Mother's Day plans may be hampered by rain, according to The Old Farmer's Almanac. Find out what's happening in Mendham-Chester with free, real-time updates from Patch.