Temps is a clean and minimalistic weather menubar application for any desktop.
* Actual weather information for any location * Four-Day weather forecast * Interactive hourly weather graph * Timezone & Geolocation support * Information directly in your menubar available * Rain, snow and thunder animation * Minimal and colorful design * Free
More info Temps for Linux
You need a free API Key by OpenWeatherMap to fetch weather information.
Because of this is a non-profit project, I'm not able to offer unlimited access to weather information by myself.
For the start you can use the built-in key to get the weather data. But it can be possible with heavy data traffic, that the service isn't available for this key all the time.
The apps are also not signed for now. So you need to grant usage by the system to run the app.