Had to switch to Weatherkit recently to replace DarkSky calls. Over the last few days I've experienced slow responses and 5xx errors too. It's a shame because I've had no problems using DarkSky in the past, and their status page was actually transparent. Apple's status page has only shown green for Weatherkit over this last week. I rely too much on weather data for this to be acceptable. Thankfully my integration with Weatherkit at this point is small, should be straightforward to move to something like Azure Weather.