September in the Rain is a 1937 Warner Bros. Merrie Melodies cartoon directed by Friz Freleng. The short was released on December 18, 1937.

Timed at 5 minutes and 50 seconds, September in the Rain is one of the shortest among all Warner Bros. Merrie Melodies or Looney Tunes animated short subjects. Due to the controversy engendered by the sequences considered to depict racial stereotyping, it has been most commonly edited to a much shorter running of four or even three minutes, with the invariable excision of the Fats Waller–Louis Armstrong "Nagasaki" production number and, often, the Al Jolson title song performance. Although not listed among the Censored Eleven, the cartoon has been exhibited infrequently, even in its brief censored version.

Re-released under the "Blue Ribbon" label, September in the Rain was shorn of its original title card containing all the credited names, however, the recovered card, along with those for other "Blue Ribbon" reissues, is available for viewing.