I heard a sound of a water flowing down the pipe and hitting the bottom of it but there was no rain, at least no rain yet. The sound was audible inside the house and in front of it (near the entrance). The sound was played for like 30 seconds, maybe a minute and shortly after it ended the rain started to fall and new sound was played (normal rain, no more water flowing down the pipe).

Screenshot 01 - taken at the moment when the sound was still audible.
Screenshot 02 - taken after the sound ended but when the rain was raining.