. >> reporter: matt shulz of imlaun creditcards.com says that although they can offer cash back and travel, the key is to stay organized. >> and you have to make sure you're keeping an eye on things. make sure you're not applying for too many cards too often, and also that you are not overspending to get those rewards, because that can really get you in trouble. >> reporter: lewis says he's not concerned with the number of reward cards he has, because he keeps his s snding in check. spending morjust to earn e rewards. >> reporter: paying off high interest if you don't pay your balance can eliminate the rewards. >>> the tonight show with stephen colbert will be live tonight. it will have matthew brod risk and a conforms by casey musgrave. it begins tonight at 11:35 live. >>> the big question is what will the rain look like? >> we're live too. the pressure is on, and weekend will be live. >> colder air returns on monday. it is a pretty warm and humid evening if you've been out and most northeast of biscane bay, fort lauderdale and hollywood, tipping scales at 5. 91% humidity. wind right now