If I book a reservation and it rains, does that change everything? Does it even effect your golfing if it rains?

You are under an awning. It would only affect you if the rain were to blow in sideways.

Rain and wind would effect the ball but you are partially covered by an awning. You likely still get wet but should not be impacted too much.

Rain, snow, heat, freezing Temps. They try to allow you to golf under all those conditions with the covers, fans and heaters.

You still have a reservation regardless of the weather. If they allow you to swing a club in a thunderstorm is their call. Call them about their policies.