The record
u/Don_csicso says they asked for the forecast while their hands were dirty, then washed them to photograph repeated failures. Two photos show “Here is the weather forecast for tomorrow.” One has no forecast beneath it; the other displays a Current Time card reading 19:50. In replies, the author identifies the watch as a Series 11 and says the request works every time they try it on their iPhone 16 Pro. Other commenters report working forecasts. The author describes using the new Siri but does not specify the installed watchOS build. This is a watch-specific experience in the report, not a general weather outage.
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A documented user report, not an independently reproduced test or an estimate of how often the problem occurs.