What would the weather be like underground?

In my world, a population of about a billion people lives in an underground cave that has growing grass, a forest of trees, an immensely deep lake to allow for rain to flow through the water cycle, and an artificial sun that provides light and warmth for everything under the ground. It evaporates the water to allow for rain as well.

My question: Would there be any wind at all that could reach this habitat, or would everything be deathly still? What would the tides on the lake be like, completely motionless?

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What would the weather be like underground?

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