After the iOS 7 update the weather app has changed my suburbs
The effect is in Mac OS X's Dashboard weather widget, and iOS 5 weather app as well. All Australian suburb data appears to have been removed, and redirected to the encompassing city.

Since both are sourcing from Yahoo, it would be safe to assume either Apple is no longer getting the data, or Yahoo has stopped providing it - I'd speculate that perhaps the bureau of meteorology has changed their terms for access to the data.

Kindof makes the iOS "Local weather" option useless.