(emphasis mine)
By Adam Grossman on March 31, 2020.
Today we have some important and exciting news to share: Dark Sky has joined Apple.
Our goal has always been to provide the world with the best weather information possible, to help as many people as we can stay dry and safe, and to do so in a way that respects your privacy.
There is no better place to accomplish these goals than at Apple. We’re thrilled to have the opportunity to reach far more people, with far more impact, than we ever could alone.
What happens to our existing products?
iOS App
There will be no changes to Dark Sky for iOS at this time. It will continue to be available for purchase in the App Store.
Android and Wear OS App
The app will no longer be available for download. Service to existing users and subscribers will continue until July 1, 2020, at which point the app will be shut down. Subscribers who are still active at that time will receive a refund.
Website
Weather forecasts, maps, and embeds will continue until July 1, 2020. The website will remain active beyond that time in support of API and iOS App customers.
API
Our API service for existing customers is not changing today, but we will no longer accept new signups. The API will continue to function through the end of 2021.
As part of this transition, use of Dark Sky by Apple is subject to the Apple Privacy Policy, which can be found at apple.com/privacy.
Thank you!
To our customers, family and friends, we are grateful for your support over the past eight years. We look forward to continuing to build great products, so stay tuned…
The Dark Sky Team
So, yes, the DarkSky API will be going away in 2022, and no new API keys are being issued starting today. Sad that another reasonable free weather service gets swallowed up and privatized. Fortunately, both the US NWS and Canada ED sources remain as freely accessible.
For current users of my DS-forecast script, it should continue to work until the end of 2021.
Since new API keys are not available, for World sites, the WU-forecast script will work if you have a PWS submitting data to WU.
USA users should continue to use the NWS forecasts via advforecast2.php and Canada users continue to use the ec-forecast scripts -- both of those should continue just fine.