During the spring, crappie will move in to spawn and the sun may not affect crappie at all. If anything, the sun can actually help to improve the fishing as colder water temperatures warm into the upper 50s and low 60s. Once the spawn is over, the sun will almost always cause some shallow water crappie to hold tighter to cover in search of shade while good numbers of crappie will often move out to deeper water. During the summer and fall when most of the better quality crappie are already deep, the bright sun can push them tighter to deep water cover and structure. Crappie may also move into even deeper water. It is not uncommon to find crappie suspended 15 to 20 feet down over 30 to 50 feet of water.
Fishing can be tougher on a bright, sunny day, but crappie can usually be caught if you find them. You may need to use live bait when the bite is finicky. If you can find some aggressive crappie, you should be able to catch plenty of them on small jigs, small jigging spoons, and small spinners.