My MacBook is overheating, are these temperatures normal?

Your snapshot does not show an over heating condition. Thats not to say you don't have an issue its just a single capture is really not the best way to see a problem nor does your capture tell us what the fans are doing which is also important.

I would strongly recommend getting a better app to monitor your system. I really like TG Pro as it shows every thing in a very clean layout. Here we also have a high water mark so when your system is pushed to the wall we can see it even if you didn't catch it at the time. If you get the full version you get a logging function which I use for tracking all of the sensors over time. Its worth it!