I've got Weather Bug Direct on my BlackBerry and that version seems to be free, I've had it for a few months now. It gives 2 Home Screen icons one for the temp and one for the current conditions outside with pushed weather updates.
You can also try WeatherEye it looks nicer then Weather Bug Direct, but Weather Bug Direct has animated Radars and 7 day forecasts were WeatherEye does not.
You can also use the Weather Underground website which many people on this forums use. I just use Weather Bug Direct for due to the ease of use, all I have to do is look at my BlackBerry for the Weather no extra clicks
