Video by 99Sounds via Youtube
Source
Rain Sounds is a collection of free rain sounds and thunder sound effects. You can download it for free from 99Sounds.
The sound library is royalty-free and copyrigh-free.
It includes rain sounds and thunder sounds recorded during a heavy thunderstorm in Belgrade, Serbia. I used an Edirol audio recorder to record the sounds.
The rain sounds are provided in high-quality 24-bit WAV format.
Free download.