Source : Webster's Revised Unabridged Dictionary (1913)

Rainy \Rain"y\, a. [AS. regenig.]
   Abounding with rain; wet; showery; as, rainy day or season.

Source : WordNet®

rainy
     adj 1: (of weather) wet by periods of rain; "showery weather";
            "rainy days" [syn: {showery}]
     2: marked by rain; "their vacation turned out to be a series of
        rainy days" [syn: {pluvial}, {pluvious}]
     [also: {rainiest}, {rainier}]