Good job getting through the rain and caring for your bike afterwards. I have heard of riders in torrential downpours ending up with water inside the frame tubes. If there's a lot of water you would hear it sloshing if you turn the frame. A little water might just make things damp and damage steel tubing over time. Also you should check your bearings for water penetration and grease removal. Sealed bearings could be OK, or they could be compromised by really severe downpours. Serviceable bearings may need to be repacked. If the grease has been washed out of the bearings, they can then be damaged in short order.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72