weather-indicator package have been removed from Ubuntu 13.04 (it crashed all the time and did not display forecasts).
What is the replacement package?
Best is my-weather-indicator for atareo https://launchpad.net/~atareao/+archive/atareao
I've stepped in as maintainer of the Weather Indicator project, and just pushed a new release that fixes the Forecast issue and most (if not all) of the crash bugs.
I've found my-weather-indicator too buggy (displaying only N/A in 4-day forecasts, unable to use Yahoo Weather, etc.), and therefore decided (at least for now) to use ClearWeather instead, although it's not an indicator, but a screenlet, included in the screenlets-pack-all package.
UPDATE: The bugs mentioned above have been fixed as of version 0.6.4 (end May 2013) and therefore there's no more need to use more memory-hungry Screenlets daemon to merely display a couple of weather forecasts on desktop.
Perhaps Cairo Dock will do. It has weather dock and other useful stuff. Small and simple.