macRumors reports:There's a strange bug with the Apple Watch today that's causing resprings whenever Siri is questioned about the weather. Asking Siri something like "What's the temperature?" or "What's the weather?" or "Is it raining?" causes the Apple Watch to crash.
Apple Watch Bug Causing Restarts When Asking Siri About the Weather
They believe this reported bug is related to the change from DST.