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: 
[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.
The best solution I've found so far is to use Dark Sky's [Time Machine](https://darksky.net/dev/docs#time-machine-request%20API). You can request the forecast for any number of days in the future, and beyond 10 days, the API simply returns historical data.