Download this app if: you want a daily prediction of precipitation.
MinuteCast by AccuWeather gives you minute-by-minute precipitation forecasts for the next two hours, for your exact location. It is the leading nowcast technology in North America and this free weather app now integrates user-submitted, ground-level observations.
Better Than Most — SkyMotion is a specialized weather app that informs you of any precipitation. It's easier to check this app than an all-inclusive weather app if you think it might rain or snow.