Photoshop Rain Effect in 6 steps

Using Photoshop CS5

1. Open any image & create new layer on it.
2. Press 'D' to set default foreground & background colors
3. For new layer select Filter -> Render -> Clouds & change its opacity to 60 (preferable 60 you can change accordingly)
4. select Filter -> Noise -> Add Noise
   • Amount = 60
   • Distribution = Gaussian
   • Check 'Monochromatic'
5. Select Filter -> Blur -> Motion Blur (Rain and its amount)
   • Angle = 73 deg
   • Distance = 10
6. Change the new layer's blending mode to 'Screen'