I'm advocating a number of things:
1) be grateful for the concern someone had to tell you about the rain they felt was coming,
2) be grateful for the specificity expressed in the prediction,
3) use critical thinking to appreciate the imparted intelligence, act on it as you wish
4a) if it doesn't rain, and you are burdened by carrying an umbrella, acknowledge it but know that you were the decider of the intelligence
4b) if it does rain, and you are prepared, acknowledge that the predictor was also right AND you too were right in your action
5) if it rains the next day acknowledge that, ask yourself, the predictor, and the weatherman why it wasn't predicted then use your critical thinking skills again. You will likely conclude that if no one saw it coming, that is the reason why it wasn't predicted was NOT because they saw it and wanted you to get soaked but simply they didn't see it.
Dude's prediction may not have hit bull's eye but it certainly hit the target.
In golf they get you a standing O for a shot like that, from so far away.
To be clear I have no i will to the OP for posting this thread and never expressed being ungrateful in that regard or for him specifying a date.
I did u critical thinking when i determined the OP hadn't given sufficient info to why his prediction was and is credible.
This is my main points that if it was to rain on a different date then I should not acknowledge the predictor for anything. I'm not sure there is any reason to give the OP credit for being wrong at that point and not sure why you think anybody should. In my eyes when you giving financial of this nature you could cause more damage then help. If someone sold coins and was able to buy back lower great but it could have been a bad decision just as easy if you ask me.