Prep the watermelon by cutting it into chunks; remove any stray seeds.
Blend watermelon, lime juice, honey, salt, and mint until completely smooth.
Taste and adjust sweetness or lime to your liking.
Pour the puree into popsicle molds, leaving a little space at the top.
Insert sticks and freeze until solid, about 6 hours or overnight.
To release, run warm water over the molds for a few seconds and gently pull out.