I'd take it in and have a set of gauges put on it to check it's performance. I chronicled over two dozen things that could affect A/C performance in another post.
But right off the bat the most common things are: Slightly low on refrigerant,
Items plugging or reducing airflow through the condenser like 9 years of dead bugs, mud, push bar, lights, winch etc. Non-working fan. Think of the AC system as a series of devices that uses pumped refrigerant to move warm air out of the cabin to the outside of the vehicle (condenser). Every component of the system has to be in tip-top shape to be able to do it's job in the heat you guys have been experiencing.
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