I would go for a lighter color because of the time of year. I would not recommend going black for anyone anytime of the year because it can be very harsh as well as difficult to remove or change. I would go for a warm caramel for the accent pieces. You can either add some woven highlights or try the Ombre as well. Both would look great against your current base. I wouldn't go too much lighter than a medium level 6 or 7. Going too light will take away from your hairs shine and luster as well as wouldn't be as flattering against your skin tone or features.

Don't put blue black on your hair now for summer, it won't turn out nice if you're going to sunbath a lot
i would go for a jennifer lopez kind of color

I would recommend highlights or a soft brown like the photo attached. I think a lighter shade would suit you very well, especially this time of year!

i think you should go with a chestnut brown. dark hair would suit you better than blonde but you would still be going lighter.

dark blonde...:*

I think gold, carmel, or dark blonde would look good.

Thx @RubyDenise! I love the third one!

Try some highlights first before taking the plunge of blue-black. Once you do the blue black it will be nearly impossible to go blonde without damaging your hair. I think these colors would look nice on you.