This issue is fixed for me with the latest release of XCode 13.4.1 Feedback provided via https://feedbackassistant.apple.com/feedback/9993526

Thanks for the fast response! To provide a little more context, my primary use-case (~3.8M requests/month) relies on location-specific forecasts at a point in time. A precipitationChance at the daily or hourly level is not useful for my customers who range from professional cyclists in the Tour de France to casual riders preparing for a weekend ride. Knowing when it will likely rain is important information that they use to plan race tactics or decide what to wear. Currently with DarkSky I am using requests that look like this: https://api.darksky.net/forecast/${API_TOKEN}/${lat},${long},${unixTime}?exclude=minutely,hourly,flags&units=ca I'm able to achieve the same result with the currentWeather dataset using currentAsOf to specify the time. This works beautifully, the only thing that's missing is precipitationChance. DarkSky supports setting the time arbitrarily in the future or past. WeatherKit currently supports currentAsOf for forecasts several days in the future and past. For my app to remain viable, I need this to continue working as it currently does. I'd also really appreciate the addition of precipitationChance.

Thanks for the reply! I'm interested in forecasts > 10 days into the future. Accuracy is not super important, but a general idea of the weather would enable users to plan for generally what the weather might be (e.g. for a trip)

I've filed a support request on this one FB11969380

I'm experiencing the same issue too, 100% fault rate since roughly 5:42pm PST.