Work With What You've Got
No matter what your natural hair texture is, humid weather isn't the time to force your hair into an unnatural style. If your hair is curly, find a 'do that embraces your curls. If you hair is straight but tends to curl up in humid weather, consider finding a look that incorporates loose, light curls.
Blot-Dry your Hair
The next time you wash your hair, gently blot it dry with a towel to get rid of excess moisture. Don't rub your hair--you'll only dry out any broken or damaged hair thus increasing the chance of frizz. Keep in mind that frizz is caused by hair trying to grab moisture from the air, so the rougher your hair cuticles are (whether your hair naturally has a coarse texture or is damaged from coloring or style), the worse the frizz.
Apply a Frizz-Fighting Serum
After you've towel-blotted and before you blow-dry, apply an antifrizz serum (or a strong-hold gel for more intense results) to your damp hair. Once you've applied the serum, comb it through so it's distributed evenly.
Use the "Cool" Shot
Once you finish blow-drying, give your hair a blast of cool air by using the "cool" setting on your blow-dryer. Hot air opens the hair cuticle while cold air closes it and seals in the moisture.
Apply More Serum
Giver your freshly dried hair a second application of frizz-fighter (pomade or gel works well). Consider keeping a bit on hand throughout the day to use in smoothing down any strands that may curl up.
And talk to your professional Hair Cuttery stylist for more tips about your hair and what you can do to keep it looking great.