Here is an easy to use Weather API https://openweathermap.org/
It requires you sign up for a personal key to use the API. They provide a reasonable amount of free usage. API Key
This api requires a free API key to work. Obtain your free key from OpenWeatherMap
You can build something like this using the Web component, the Map and a LocationSensor and the api.
Use the advice in this link Weather app with openweather - #5 by ABG as one way to extract the forecast.