Weather version of Murphy's law

I had a large (5000L) rainwater take installed and plumbed during the week. I am looking forward to being able to water a (small) lawn again, and being able to water vege patch without treking up and down the garden with a watering can.

The weather seems to have returned to the pattern of 'rain 5 days from now' - the 5 days away never actually arrive.

Is there a version of Murphy's Law in operation here? Plenty of rain - until you try and catch it!