Light, intermittent rain dampens hunter scent, mutes leaf crunch, and doesn't bother deer at all. Drizzle conditions during the rut produce reliable daylight buck cruising. Driving rain or thunderstorms suppress movement until they pass.
The post-rain hour is where the leverage is. Once a strong rain stops, deer that locked down in cover come out to feed and dry off. A still, drizzle-cleared evening with rising pressure and dropping temperature is a textbook rut sit. Pair with state rut dates for the highest-value timing.