I would love some insight on how you found that out. I searched but was unable to find anything related to an API. And it is way better than what I achieved, since for some places (Yosemite Valley for example) the coordinates obtained from Open Cage's API differ to much from the ones expected by WeatherWidget.io to be corrected via trial and error.
There are many ways to do this, but the easiest way is to look at the Network tab in the browser developer tools as you load the page, type an address in, and generate the code.
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[ 2.5 ms ] story [ 12.6 ms ] threadChIJawhoAASnyhQR0LABvJj-zOE is google maps api placeID
returns something like:
41d0128d98/istanbul
PS: you can get placeID with https://forecast7.com/api/autocomplete/istanbul
Then from there you can use right click -> copy as curl.
Then https://curl.trillworks.com/ to convert curl request to language of your choice.