Forecastie is a great app for staying updated with the surrounding weather conditions. Forecastie is designed to be as simple and intuitive as possible. This app uses OpenWeatherMap as a data channel and the weather updates are tiny so that you would not use up any significant internet bandwith.

FEATURES
» One of the most light weight weather apps on Google Play!
» Supports geo-positioning to retrieving the weather conditions for your current location. Manual location input is also supported.
» Weather map to show rain, wind speed and temperature.
» Detailed 5 day forecast graphs.
» Intuitive, seamless user interface and simple design.
» Support for widgets.
» Choice of many units.
» Dark mode.
» Offline functionality when there's no internet connectivity.
» Supports all Android versions above and including 4.0.3
» Free and open source software.

Forecastie is licensed under GPLv3, with the source code available here: https://github.com/martykan/forecastie
You can help translate it here: https://www.transifex.com/forecastie