C525 Pilot reported a runway excursion on wet runway during the landing rollout.

Narrative

I was operating a Citation CJ2 (525A) from ZZZ1 to ZZZ. There were storms forecasted during the time of arrival into ZZZ. I made a mental note of the weather prior to takeoff and noted the winds favoring Runways XX and XY and started to plan for that unless the weather had a change by the time I arrived. Runway XX is the only runway from those two options that has an instrument approach available. They were broadcasting the VOR XX with winds 120 at 12. I requested the RNAV GPS XX instead due to my equipment on board that could fly that approach. While on the descent to ZZZ I noticed on my radar there was a cell over the airport where I would be approaching from. I asked ZZZ Approach if they were showing the same thing. Initially; he said no. While being vectored for the approach ZZZ [TRACON] told me they actually do see a moderate cell that was over the final approach fix ZZZZZ. I made note of this because this could affect my approach and cause unstable wind conditions and being aware of windshear and/or a wind shift. I calculated my REF and VAPP to be 108/115 based off my weight at the time. The runway was very wet and I calculated my wet landing distance to be within tolerances for Runway XX. We experienced light to moderate turbulence during the approach. The rain was coming down extremely hard at the time as well. I was able to to stay at around VAPP (115) during the descent. I could then visually see the runway at 700 ft. so I pulled the power back to VREF (108). I remained at VREF over the threshold and then pulled power to idle. I started to slightly float and it felt like a wind shift had occurred and had a tailwind. I put the airplane down and deployed the ground flaps and speed brakes on touchdown. I then applied brake pressure and they initially started to slow the aircraft and then more than halfway I lost all braking action and could not get the aircraft stopped. The anti skids did not feel like they were working. It was at the point where I could not commit to a go around and maneuvered the aircraft into an area of the end of the runway where I thought no one would be injured and the aircraft would not sustain severe damage. This was at the approach end of Runway XZ. No one was hurt and the airplane did not have any damage. Going forward I will take the steps necessary to make sure this does not happen again.