I am creating a custom email template within a custom module and need to show the current month in it. I'm not sure if using a custom variable will work but that was my first thought. What would be the best way to display the month in an email? I'm on 2.2 commerce edition
That variable will be filled with PHP (I guess) on your module so you should fill the variable with the right value.
You said before that "I am creating a custom email template within a custom module and need to show the current month in it"
Can you share the part of the code you're using to send the email?