Weather in NJ

I just checked the weather for this week and it's going to be pretty cold this Saturday (4 days before Camp Baby). Now, when I say "pretty cold" keep in mind that I'm from Florida (wearing sandals, pedal pushers and a wifebeater right now and it's midnight) But still — lows in the 20's and highs in the 30's... That's cold! I'm not even sure I have clothes warm enough for that kind of weather.