With the humidity on the court, the balls will load in water which will make them heavier, and they will bounce less. It will have to adapt his gesture and power to have the same performance as usual and mainly for the lob.
The windows are wet, so the floor is likely to be wet too. It will be necessary to pay attention to your supports during the displacements and at the time of the striking. Otherwise you will slip and potentially hurt yourself.
The rebound on the glass will also be changed. With the moisture on the walls, the ball will not behave the same way as usual. In these conditions, the ball will fall faster to the ground, so you will need to be alert. During a trajectory where the ball makes the double-wall, it will be necessary to be attentive because the second rebound on the glass will be lower than usual.
The feeling of the ball's shot will also be different. Indeed, with the humidity, the ball will not have the same behavior, it will slip more when it meets your racket. You will need a moment of adaptation and everything will be as before.
In these complicated conditions, your shots should be rather flat instead of cutting them to prevent the ball from slipping off your racket on impact. You could lose control of the ball, and make an avoidable mistake.