Question: I'm working on a small project and am trying to find a way to get the very extended hour-by-hour forecast for a location. Most services (Darksky, etc.) seem to offer 7-day extended hourly forecasts, but I'm not able to find anything beyond that.

Does anyone have suggestions?

Answer: 
[Weather Underground](https://www.wunderground.com) and [Intellicast](http://www.intellicast.com) provide ten day forecasts in a beautiful (to a nerdy engineer) graphical format, in hourly increments. The skill in the last two to five days of those extended forecasts is suspect.
[ECMWF](https://www.ecmwf.int/en/forecasts/charts/catalogue/?facets=Range,Medium%20(15%20days)) (European Centre for Medium-Range Weather Forecasts) provides global forecast to member organizations and probably there is a way to obtain their hourly forecast up to 15 days. They provide average fields to the public, but the hourly data is not available that way. You can contact them directly and ask them about availability.