Our plane was down for annual for a few weeks, but it was cleared for flight again recently so I made good use of it. We had some ForeFlight folks in town, so one pair of trips was to act as a shuttle to KGSP and back, about a 30 minute trip. The first day brought fairly crummy weather. Calm winds and good temperatures, but plenty of rain and low clouds. GSP was clear so that side of the trip was easy, and even though it had been a few months since I worked with a Tower I felt quite at home with it. Coming back to Rock Hill was a bit more interesting though. As we approached there were red radar returns right over the airport. We had to shoot the GPS 2 instead of the ILS as the ILS was down for maintenance. That meant we could only descend to 500' AGL instead of 200' AGL. ATC had us slow down for an aircraft in front of us. I happily did so as that gave the stronger rain time to move away from the airfield. Luckily the clouds at the airport were barely above 500'