Your midday New Jersey weather update Multiple freeze warnings are taking center stage across New Jersey this Monday as a cold air mass settles over the region. Here comes sub-freezing temperatures tonight that could drop as low as 22 degrees in some areas, posing a serious threat to sensitive vegetation and outdoor plumbing. Right now we're sitting in the upper 40s across most of the state, but temperatures will climb to around 54 degrees by 4 P.M.