From this distance it is hard to see the details enough to comment on what it is. Does it have runners over the top of the ground about the size of spaghetti (indicating bermuda) or runners more the size of a small soda straw (St Augustine)? St Augustine is coarse bladed while bermuda is fine bladed.
Maybe a picture will help. Ignore the grass on top (centipede) and look at the lower grass (St Augustine).
Before you mow it St Augustine has the characteristic rounded blades. Actually bermuda looks more like the centipede than it does the St Aug. Bermuda blades are a little finer.
In any case I am thinking the grass has just not come out of dormancy yet. Water it once a month for now and prepare to increase the watering frequency to once a week by June. Water deeply when you water. I water for 3-5 hours per zone with my water pressure and sprinkler setup.