Making rain

I will show you how to create it right now

Step 1: duplicate layer (Ctrl +J)

Step 2: Adjustment lightness for picture in or other to create a dark sky which is going to rain by using Level

Step 3: create a new layer

Step 4: Fill background with 50% gray

Step 5: Filter -> Noise -> Add noise

Choose Monochromatic and Gaussian

Maximum amount (400%)

Step 6: Filter -> Blur -> Gaussian Blur

Radius: 0.5 pixels

Step 7: Modify level

Channel RGB

Input level: 230 / 1.13 / 255

Output level: 0 / 255

Step 8: Filter -> Blur -> Motion Blur

Choose appropriate angel of the rain for your picture

Distance about 20 pixels

Step 9: Modify level to make the rain clearer

Step 10: Blending 2 layers with Screen Mode

Have Fun!!!