Yes, if you’re just the type to fish for whatever’s there, it’s best to fish after it pours. Because by then, fish would have already adjusted to the sudden changes in water. Getting more oxygen during the rain means that fish will be hungrier though, so make sure your chumming game is on point then! Also, use brighter bait as rain makes for murkier waters, decreasing visibility underwater. Colorful tackles would be easier for them to see and bite. Lastly, know exactly where to fish! Topwater or a few feet under the surface is generally best when the rain stops as higher activity means they’re likely in shallower waters.