Sm1smom
Super Moderator
I renewed my I 20 last year when I traveled home and it is still valid for August 2018 but actual visa on my passport is expiring end of this month.
The expiration date of your actual visa is irrelevant in this case. The visa is meant for admission into the US, and there's no way you can apply for a visa extension from the US anyways. You're good as long as your I-20 is still valid.