There is a downloadable widget already created for this all you need to do is get a API Key.
Simply download in from HG and then enable it and enter your info.
In HG click configure then Maintenance then under system options click on the install package button to the right package manager.
In the window that appears scroll down to "Weather and Enviroment" and open it.
next click on "Open Weather" then click install package.
I think maybe you meant to download it from
https://openweathermap.org? I can seem to almost do that. I can get an API key... but it says the API key is invalid. I have no downloadable widget from here. I thought I might be smart enough to copy their API call? code? into HG in a new widget, but, alas, no luck... HG says new widget is invalid.
I spent an hour screwing with this and cannot seem to get any widgetry magic. I CAN program an Arduino, I can decode C+ language, I WAS published many times as a young punk in the 1970's with machine language games in various of the cool top computer magazines at the time. I have designed new gadgets that do what no one did before that Boeing, Spirit Aerospace, GKN, etc., love, I even was/am the electrical engineer in an outfit that thinks they have an almost perpetual motion machine motor that Elon Musk has come to see. But I'll be damned if I can figure out how to make a gdam widget for my poor HG to see weather.
Can you take pity on my Mr. T? Give me (us?) a step by step for dummies how to make this work? I would be tickled pink to send you a paypal case of beer in exchange, or case of wine, or your choice equivalent. For now, I will go drink mine and drown in my sorrows.
Until then...