Most likely (although its not possible to quantify this benefit with the information provided - Im not suggesting the benefit is worth the cost, just that its still there.)
One of the things a CDN typically does is distribute static/cache-able content closer to the audience. This speeds up their access and reduces server load.
Another benefit is having/DoS protection - Attacks will go to the CDN which can typically detect and handle these better then a typical web server.
There are other possible advantages as well, like handling redirects, https offload and outage monitoring.
Several times a day is slow: you will have way more reads (visitors) than writes (updates). As long as this stays true, your website will benefit from using a CDN.
If you need your users to see your content as soon as it's posted, it's still possible: most CDNs allow you to purge the cache manually, or via calling an API. Some even allow you to select which pages you are purging the cache for, reducing the need to repopulate their cache.
Other benefits (and drawbacks) are the same as for static websites.