SP-Weather
SP Weather forecast joomla module
This is forked from https://github.com/JoomShaper/SP-Weather. That repository was not up-to-date for whatever reason so I updated from v2.2.3 to v2.3 as available on the Joomshaper website.
Then there was also a problem with the module stripping out from the location string you enter. Openweathermap.org does not like that and return unknown location. This issue has been fixed.
To install on a Joomla site, just Clone and download the zip file. Then install tha zip file as you would any Joomla module.