Set up a monthly alarm?

You could set up a calendar event with an alert, though that is going to be pretty quiet.

You could also look at an app such as Calarm which will set off alarms based on calendar events. They're real, very annoying alarms.

Or, you could see about setting up a shortcut to do what you want. You can either write your own or do an internet search and see if anyone else has written such a thing.

Shortcuts User Guide - Apple Support

You might also want to look at another app, Yoctoville's Alarmed ~ Reminders + Timers. It has a lot of features for recurring alarms and timers. It's old but, as far as I know still works just fine. There are lots of features and a bit of a learning curve but you might find it helpful.

Russ1952 wrote:

How can i set up an alarm to go off once a month at a set time?

I use the Reminders app. I create a monthly reminder, and enable an audible notification for it. I have quite a few, from cleaning heat pump filters to replacing toothbrushes.

Lawrence Finch wrote:

I use the Reminders app. I create a monthly reminder, and enable an audible notification for it. I have quite a few, from cleaning heat pump filters to replacing toothbrushes.

I've gotten too good at only barely registering Reminder notifications.

I find almost all alarms annoying so, you may find them less so. However, they are going to be better than the Calendar notifications.

Best of luck!

Russ ~ A custom automation in Apple's Shortcuts app can be configured with its own volume level & sound file:

Create a new personal automation in Shortcuts on iPhone or iPad

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Alancito, I always hope you will drop by when I've mentioned Shortcuts!