tint2 buttons support 3 mouse options: right click, left click and middle click.
I kept adding weather sources and exceeded the 3 options. My solution was to use ~/scripts/yad_weather.sh. You can add as many locales and sources to the yad scripts as you want. I also had a wttr.in option with weather_forecast.sh. You should be able to return weather.sh to your local value and edit ~/scripts/weather_forecast.sh for the wttr.in source.
I recommend reading the wttr.in documentation as it will allow you to pick forcasts more accurately.
https://wttr.in/:help