I suspect that you're right about the weather, this would probably be a be a place with a lot of storms.
On the other hand, if there's both sufficient water AND enough air for life as we know it on our planet's surface (excluding the extremeophiles like the flora living in Grand Prismatic Spring for the moment), the terminator wouldn't be nearly as clear as it is on Mercury, which has no atmosphere. Oceans of air and water would help to distribute heat throughout the world, much like they do here on Earth.
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I suspect that you're right about the weather, this would probably be a be a place with a lot of storms.
On the other hand, if there's both sufficient water AND enough air for life as we know it on our planet's surface (excluding the extremeophiles like the flora living in Grand Prismatic Spring for the moment), the terminator wouldn't be nearly as clear as it is on Mercury, which has no atmosphere. Oceans of air and water would help to distribute heat throughout the world, much like they do here on Earth.