I recommend J-Curling Mascara.

I bought this on a buy-one-get-one-free basis. It offers great value for money. I've only used one myself, but it's nice to have an extra spare. In particular, it lengthens the lashes well and doesn't droop, so if you're looking for a product that lengthens your lashes without clumping, you'll love this mascara. It's perfect for hot and humid weather like this. It's just right to buy it on a buy-one-get-one-free sale. I recommend it.