If you mean fishing on a rainy day, the best options here are lures and gear that perform well in low light, surface chop, and wet conditions. Cliquebaits RAINY DAY is built for aggressive crankbait fishing in overcast, rainy, or dark-water conditions. The two Smity topwaters are strong choices when fish are willing to rise in low light and rain. rainysflies Rainy's Panfish Assortment: Surface (18 Pack) fits if you’re targeting panfish near the surface. For staying dry, Gill North America, Inc. Gill Voyager Rain Jacket Olive is a practical rain-fishing layer.
Switch away from topwater if the rain cools the bite and fish stop showing on the surface; then a subsurface fly or deeper crankbait is usually better. If you’re fishing open water with a trolling spread, a bait accessory like Hard Head Custom Baits Twisted Umbrella is more appropriate than a casting lure. For keeping tackle dry in heavy rain, use waterproof storage instead of standard bags.