not know enough to come in out of the rain

not know enough to come in out of the rain

To not have very much intelligence or common sense, especially when facing or presented with a difficult situation. I'm not surprised his latest business venture failed too—that fool doesn't know enough to come in out of the rain. Cut him some slack, Jim. You didn't know enough to come in out of the rain when you were his age, either.
See also: come, enough, know, not, of, out, rain
Farlex Dictionary of Idioms.

not know enough to come in out of the rain

Fig. to be very stupid. Bob is so stupid he doesn't know enough to come in out of the rain. You can't expect very much from somebody who doesn't know enough to come in out of the rain.
See also: come, enough, know, not, of, out, rain
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • be like ships in the night
  • not for a second
  • not for a minute
  • not for a moment
  • aint
  • ain't
  • aren
  • not for a/one minute/moment/second/instant
  • not for a instant
  • not by any means