Abstract: A golf bag rain cover is used to cover a club opening of a golf bag so that the golfer's clubs can remain as dry as possible during play. The golf bag rain cover may comprise a one-piece shell being constructed of a water-resistant material which is held in a bonnet shape over the club opening by several extensible rods. The golfer simply reaches up and under the shell to retrieve or replace clubs. In alternate embodiments, the deployment of the rain cover can be adjusted to allow more or easier access to the clubs. Also in alternate embodiments, the rain cover may be stowed in a stowage element integral with the golf bag.