Without permanent temperature differentials across the water plain, the whole place gets the same daily total insolation, you wouldn't have any permanent ocean currents. Not related to the weather but this means that the water will be anoxic at depth and life as we know it will have serious issues surviving.

What you will see is weak, transient, fluid circulation events on a daily cycle, the subsolar point will be slightly hotter than the areas around it at any given point creating a relatively high level of evaporation and atmospheric convection above the point of maximum radiation absorption. This is going to produce an upwelling in both the atmosphere and the underlying ocean but not particularly strong ones. The evaporated moisture is going to form clouds as it rises but without Coriolis these are going to simply rise to their dew point and then dump their load. Rather than hurricanes etc... there will simply be relatively shortlived ranks of clouds behind the subsolar point that bleed out their water over the course of the afternoon and the night that follows, dawn should find the sky clear. I would expect overnight fog to be a given since the ocean is always going to be warmer than the air after the sun goes down and surface evaporation should continue.

Waves are going to be minimal except where the winds feeding into the subsolar low pressure cell are active, the waves that are "chasing the sun" (approaching the subsolar point in the same direction as the subsolar point is moving across the surface) have the ability to build on themselves somewhat and will be larger than those coming the other way.

Without permanent temperature differentials across the water plain, the whole place gets the same daily total insolation, you wouldn't have any permanent ocean currents. Not related to the weather but this means that the water will be anoxic at depth and life as we know it will have serious issues surviving.

What you will see is weak, transient, fluid circulation events on a daily cycle, the subsolar point will be slightly hotter than the areas around it at any given point creating a relatively high level of evaporation and atmospheric convection above the point of maximum radiation absorption. This is going to produce an upwelling in both the atmosphere and the underlying ocean but not particularly strong ones. The evaporated moisture is going to form clouds as it rises but without Coriolis these are going to simply rise to their dew point and then dump their load. Rather than hurricanes etc... there will simply be relatively shortlived ranks of clouds behind the subsolar point that bleed out their water over the course of the afternoon and the night that follows, dawn should find the sky clear. I would expect overnight fog to be a given since the ocean is always going to be warmer than the air after the sun goes down and surface evaporation should continue.

Waves are going to be minimal except where the winds feeding into the subsolar low pressure cell are active, the waves that are "chasing the sun" (approaching the subsolar point in the same direction as the subsolar point is moving across the surface) have the ability to build on themselves somewhat and will be larger than those coming the other way.

Oops, I hadn't done the math, the solar radiation sweep is moving so fast that tropical intensity radiation is insufficient to create a meaningful energy budget for almost any weather phenomena to form. You'd need to be looking at something like being 1AU from Sirius A to get any major weather. You would still get waves if the radiation source is a star though, gravity induced like a tide but going millions of miles an hour.