Integration to get weather forecasts from the SRF Weather API provided by SRG SSR (Schweizerische Radio- und Fernsehgesellschaft).
Head over to Configuration > Integrations to set the integration up.
Press the plus button and search for "SRF Weather".
The first step will ask you for API credentials, refer to the next section for instructions on how to get them.
Go to https://developer.srgssr.ch and create a new account (or login with your existing one).
Open My Apps and press "ADD A NEW APP".
Give the app a name like "Home Assistant" (the name is irrelevant). Make sure that the Product is set to a SRF-MeteoProduct, e.g. "SRF-MeteoProductFreemium". All other options may be left at their default value.
Open the "Info" tab of the app you just created and find both keys in the "Keys" column.