Macbook pro retina temperature

Hi guys!

Please, what is the normal temperature of the CPU for Macbook Pro retina?

When only surf the internet (Safari) has a temperature of about 50 ° C. If I open two browsers (Safari, Chrome), Google Drive, powerpoint, mail, word, has a temperature of around 70 ° C. When intensively using Google Maps (quickly we cross between states), sometimes even 80 ° C. It's OK?

I have a MacBook Pro (Retina, 13-inch, Mid 2014)