While amusing myself today recording a bit of an outdoor Brass Band concert in a heavy rain storm (don't ask), I discovered to my surprise that a Senny G2 system mounted on the camera inside a Kata raincover worked without any problems, even though the aerial (antenna) was in contact with the material of the cover. I would have predicted all sorts of interference, which is why I've never tried using a radio receiver inside a raincover before. Certainly beats using an oncamera mic enclosed in the rather rude looking extension tube in the raincover which acquires a fine recording of the rain and other noises from the cover in my experience.

Apart from using wired mics, any other tricks on recording in the rain to share?
How does one protect mics from rain?

Yeah, Trojan size large unlubricated condoms. Stretch them over the bodypacks before you give them to the talent. Also good for people that sweat a lot or for any dusty environment.

I prefer sandwich sized zip lock bags. I don't get as many "looks"

O|O
\--/

I regularly use radio mics on sports umpires and players and put them in latex surgical gloves, antenna in one finger and the mic cable comes out a small snip on another finger. The wrist is then folded over with a wrap of electrical tape.
Neat tidy and sweat proof.....

I prefer sandwich sized zip lock bags. I don't get as many "looks"

Unless you already have the Trojans on hand. ;-)

for interference UHF is certainly a lot better than the micron VHF radio mics we used in the 80's, as for waterproofing whatever works is best but I do like that idea with the surgical gloves.