How accurate are the weather forecasts?

I am planning to go fishing on Saturday. My pal Emmanuelle stated that the weather was going to be crap according to the BBC and that we should maybe think about fishing somewhere a little closer to home. This made me scout around for other weather forecasts and I am surprised at how different they all are. Here is a selection

BBC Weather
Weather Underground
Metchecker

Look at the five day forecasts- unless they have changed (which I doubt) they are all completely different. This made me think that they are all talking crap. It turns out that I am not the only one as I found this highly informative link.

How accurate are the weather forecasts?

Essentially the BBC are only accurate 40% of the time. Good gried I could predict the Weather better than that.Yes, when asked I would say- it will be variable.