This is most likely a male Cicada killer guarding his territory and looking for a perspective mate.
Although cicada killers are large and fearsome looking,
Male-cicada killer wasps cannot sting and female cicada-killer wasps are not aggressive and rarely sting unless they are grasped roughly,
stepped upon with bare feet, or caught in clothing, etc. wikipedia.org
Cicada Killers are beneficial, they control the Cicada population which damage deciduous trees.