What do you mean? You want something that has the weather forecast on your website? If this is what you mean then you can look at http://www.weatherforyou.com/snapshots/
Don't know how sophisticated you want it to be or anything...
Unfortunately I am not aware of anything like that in existence
I know where you can find these forecasts but have something like that linked on your page I don't know. Google tide forecasts for websites or variation of that. You might find it.