March can bring very cold (and windy) days & nights as well as very nice, sunny, warm days & mild nights. I have seen temps go as low as in the 30-40's at night or as high as teh 70's. I live in SW Fl and an example of what I am saying is... yesterday we were in the high 70's...today we are in the 50's & they say tomorrow morning it may be in the 40's. If you are trying to figure out what to pack, take some of everything & layer... you will not need a "winter" coat, but a jacket that you can layer with a sweatshirt or sweater if need be. You can bring pants, capri's & shorts. Take short sleve shirts, but stay way from tank-tops...or any real "summer" clothing.