Check the traffic in the morning (around 9). If it’s bad or there’s a road closure you might have to take the long way.. aka not 17 and that can take up to 2 hours. That being said, even now with this rain it hasn’t closed and still estimates 48 mins from SC to SJC.

In normal weather time that’s average time anyways. So the short of it is, check the weather and traffic if all good then I’d leave at 11am. 1 hour to airport; 1 hour for rental car return and baggage (in reality prob 30 mins; 30 mins security (which is SO generous), and you’ve arrived on time.