Starting this October, Google will penalize any website that does not have a SSL (Secure Socket Layer) Certificate or “secure website.” You can see the small padlock symbol in the address bar and the website address beginning with https:// (the s stands for “secure” encryption) if a site has SSL.
If you do not have this in place by October, you will lose Google Ranking. In fact, Google is sending out emails to Search Console users stating that if you don’t switch over to https, your website will have a “NOT SECURE” notification pop-up to all Chrome users. Here is the email that was sent out.
So, in my opinion, you must act now before it’s too late! The last thing you want is a warning on your site which could disrupt your traffic and ultimately drive your customers away. If you migrate your site from HTTP to HTTPS, Google treats this as a site move with a URL change. This can temporarily affect some of your traffic numbers. For more information on this big announcement from Google, read this article.