curl question regarding security

If I use curl to copy the html off of a website, would the owners of the website think I was trying to hack them?

As an example, say I decided to build a mysql database program that records daily rainfall in a specific area of the country. I would be using curl to copy the website daily, then using gawk to find the amount of rainfall in the html file, then importing this value into a mysql database.

Or would the owners of the website even know I was using curl?

Thanks in advance