I’ve used https://open-meteo.com/ before and I think it’s the same type of open data being exposed. These types of projects are great for stuff like home automation. I’m using to to improve my predictions for power generation (PV) and consumption (heat pump). Planning to is ergst to optimize home battery charging in the future. (Disclaimer; open sourced a small go library for open meteo, but otherwise not affiliated)
I've got a bunch of moving parts in my system, including realtime (5-minutely) energy pricing. If it looks like it's going to be cloudy tomorrow I put my thumb on the scales to make it more likely that my system will buy power from the grid to top off the battery so I can ride through any price spikes.
I don't have the stats chops to determine whether I'm actually saving any money with this approach, but it sure is a lot of fun.