Hmmm well how about havin a tiny link under each postbit sayin somet like "View your local weather" and then when clicked it takes them to a custom VB page displayin the info. And also in the USER CP next too PRIVATE MESSAGES put LOCAL WEATHER just for the sake of it

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As for them enterin stupid locations i know wut ya mean, i own a rap board so go figure lol. But they shud just get what i got, when i had UK. You just get the weather home page.
Wud b nice just havin like a Sun picture in postbit if its sunny for u, Or Rain if its rainy etc