If you're going to be outside most of the time(epecially in the middle of the afternoon) I'd suggest wearing a cute(but not too revealing) tank top or sleeveless lightweight blouse with some denim or twill shorts and sandals.
Fresh cotton cute dress or a pair of shorts and top from forever21 or Express.
If you're going to be outside most of the time(epecially in the middle of the afternoon) I'd suggest wearing a cute(but not too revealing) tank top or sleeveless lightweight blouse with some denim or twill shorts and sandals. If you're not going to really be outside much and you'll be inside where there's air conditioning or if your date is later in the evening/night time, I'd suggest wearing still a cute sleeveless top (or short sleeves) with some nice skinnies and flats/sandals or if it's still slightly warm you could roll up your skinnies to make them ankle jeans- which is still very cute and appropriate! If it's at night time don't forget to bring a little cover up, just in case if it cools off a bit. I'm sure you'll be comfortable in a single layered outfit the whole time though. Good luck and have fun!