Just pack regularly but just add some sweatshirts and jeans.
I survived in New York in the rain in March in tshirts, sweatshirts, and jeans, and I live in California which never has freezing cold rain in the part I lived in, so you'd do just fine in jeans and sweatshirts. For the day, though, maybe bring a hooded zippered sweatshirt, the thinner variety, so if you get hot it won't be so bulky as an actual sweatshirt to carry around.
I don't see how the weather can be cold- here its 90 degrees. Anything below 60 degrees is cold. In the 60 degree zone its a little chilly, but otherwise nice in the night. Heck, I'd be GLAD if it got cold at night after sleeping in 91.5 degree rooms for a week.