I just hope you didn't ask your shinny new Apple Watch about the weather on 4th November. If you did, you probably got a rude response. Most Apple Watch series 3 owners reported their wristwatches crashed, if they asked Siri how the weather was on that day. It wouldn't have crashed if asked about the weather in subsequent days, but this odd situation affected user across North America and Europe.
Reddit user, Rgsteele, theorized that the crashing was related to end of Daylight Saving Time. The issue appears to be over and you can now ask Siri if it will rain or not.
In the previous years, Apple Watch didn't have this issue but its notable that iOS devices had long-running alarm and calendar problems related to DST shifts.
There's no guarantee the time change caused it and its not certain how much of the fault rests in Siri's servers. However, its safe to presume that Apple will prevent this from happening again.