I've thought about it but never outside before.
Last night, May 22nd, I got out of the hot tub and went to the top level of my deck to dry off. I'm fortunate to have a little privacy and therefore can get in and out of the tub naked without fear of being seen by the neighbors.
As I towelled down I was aware that a thunderstorm was approaching rapidly. For some unknown reason I felt incredibly horny. I put the towel to one side and leisurely began to stroke my cock. At that time I had no intention of finishing myself but just to enjoy the feeling of the darkness, the approaching storm and the excitement of doing something 'naughty'.
As I continued to stroke it became obvious that I was not going to able to stop and this could be a first for me. The thunder rolled, the lightning flashed,and as the storm came nearer, the rain began to fall in heavy drops. I reached the point of no return just as a magnificent lightning flash crossed the sky. It lit up the whole back yard park. I wondered, momentarily, whether anybody could see me.
My knees almost buckled under me as I had a wonderful orgasm and only when it was over did I feel that I had done something that I shouldn't have. It was when I returned with a bucket of water to remove the 'evidence' that I realised that the storm had done the job for me. Will I do it again? I don't know. Was it good? Unbelievable. Otherwise, I wouldn't tell you about it.