I don't know what kind of impact it would have. Obviously, the database is being accessed on every page load anyway. If someone wanted the weather data on every page, there would need to be additional related calls to the database for every page, also, regardless of how or where the code was put. If it's too much of an impact, then that board won't be able to have it on every page.
Personally, I do not believe it's necessary or important to have the weather on every page. Even if you had a standarized set of boxes of stuff that appear in a column on the side of the forums, I think there is certain stuff that doesn't need to be there on every single forums page, maybe just the home page.
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