Add an alarm on Apple Watch Ultra
Use the Alarms app 
to play a sound or vibrate your Apple Watch Ultra at a set time.
Siri: Say something like: “Set repeating alarm for 6 a.m.”
Set an alarm on Apple Watch Ultra
Open the Alarms app
on your Apple Watch Ultra.Tap Add Alarm.
Tap AM or PM, then tap the hours or minutes.
This step is unnecessary when using 24-hour time.
Turn the Digital Crown to adjust, then tap
.To turn the alarm on or off, tap its switch. Or tap the alarm time to set repeat, label, and snooze options.
Tip: To create an alarm that taps your wrist, but doesn’t make a sound, turn on silent mode.
Don’t let yourself snooze
When an alarm sounds, you can tap Snooze to wait several minutes before the alarm sounds again. If you don’t want to allow snooze, follow these steps:
Open the Alarms app
on your Apple Watch Ultra.Tap the alarm in the list of alarms, then turn off Snooze.
Delete an alarm
Open the Alarms app
on your Apple Watch Ultra.Tap the alarm in the list.
Scroll to the bottom, then tap Delete.
Skip a wake-up alarm
If you have a wake-up alarm that’s part of your sleep schedule, you can skip it for just that evening.
Open the Alarms app
on your Apple Watch Ultra.Tap the alarm that appears under Sleep | Wake Up, then tap Skip for Tonight.
To learn how to create a sleep schedule, which includes wake-up alarms, see Set up Sleep on Apple Watch Ultra.
See the same alarms on both iPhone and Apple Watch Ultra
Set the alarm on your iPhone.
Open the Apple Watch app on your iPhone.
Tap My Watch, tap Clock, then turn on Push Alerts from iPhone.
Your Apple Watch Ultra alerts you when an alarm goes off so you can snooze or dismiss the alarm. (You aren’t alerted on your iPhone when your Apple Watch Ultra alarms go off.)
Set up Apple Watch Ultra as a nightstand clock with alarm
Open the Settings app
on your Apple Watch Ultra.Go to General > Nightstand Mode, then turn on Nightstand Mode.
When you connect your Apple Watch Ultra to its charger with nightstand mode turned on, it displays charging status, the current time and date, and the time of any alarm you’ve set. To see the time, tap the display or lightly nudge your Apple Watch Ultra. Even nudging or tapping the table might work.
If you set an alarm using the Alarms app, your Apple Watch Ultra in nightstand mode will gently wake you with a unique alarm sound.
When the alarm sounds, press the side button to turn it off, or press the Digital Crown to snooze for another 9 minutes.