It pleases me immensely to have found a page of Finnish weather-cams. There's one in Lahti, although I'm not quite sure where it is in the town, and one in Savonlinna, actually showing the castle (looks like sunset there right now, which is rather nice). And several in Helsinki.
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You may want to take a look at other pages of the site, too.
You do read Finnish, I hope.
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Lahti, Upon silta does not ring a bell, I'm afraid. Since Upo is a big industry, one might guess it to be located in the eastern industrial area.
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