Where/When Apply Internship California Science/Engineering?

<p>Where in the peninsula of the SF Bay Area in California are there opportunities for summer internships. I am a high school senior this year and I wanted to find out if there are any places were I could intern preferably in a STEM field since I am going to major in materials engineering. I saw another thread mentioning intern applications, so I wanted to know when I can start applying. I tried looking online, but I haven't found relevant information, so if you know anything about this could you please let me know? Thanks. :)</p>