+1, traditional cup/cone bottom brackets handle water very well. Even without a weep hole the venting between the spindle and cup allows the water to evaporate. The irony here is that weep holes weren't necessary, until the advent of sealed BBs or the use of liners, which eliminated the venting past the spindle.

Years ago I made water "seals" by cutting donuts out of sheets of open cell foam, coating them in grease and trapping them between the crank and cup face. My road/touring bike went over 50,000 miles of mixed weather riding, including plenty of rain, with minimal maintenance --- teardown once per year (about 5k mikes) in the Spring to make sure all road salt deposits were removed --- and was still on all the original bearings (except the headset) when I retired it.