This article explains how to set an alarm on an Apple Watch using Siri or touch commands. The instructions apply to all Apple Watch models.
Setting an alarm on the Apple Watch via Apple's digital assistant is similar to setting an alarm on the iPhone.
Make sure Siri is enabled on your Apple Watch. Select Settings > Siri. You can turn on or off Hey Siri, Raise to Speak, and Press Digital Crown to choose how you activate Siri.
Tell Siri to set an alarm by saying, “Hey Siri, set an alarm for 6:15 p.m.,” or “Set a repeating alarm for 5 p.m. every day.” You can also use relative time: “Set an alarm for 45 minutes from now” or “Set a weekend alarm for 12 p.m..”