I find the met office and BBC to be complete works of fiction.
The BBC is excellent, if you understand how it’s done and what the caveats are. For example, if you’ve got a front moving south it could say bring rain to a certain spot. Forecasters have to predict how fast it’ll be going and then consequently the timings of the rain. If they get it a few mph out it’ll mean the difference between some place getting rain or not. In terms of the overall weather, they are very accurate, but it just isn’t possible to predict to that level of accuracy in certain situations.
You could also have say and east-west rain band, which might sit 10 miles either side of where they predict. Again a very accurate prediction, but in terms of a particular town (as it sounds like in the OP’s case) it could be a long way out.
Incidentally today’s forecast in Cardiff was warm and sunny. It’s warm and sunny.
A bit of understanding really helps. I don’t pay much attention to the rain/sun icon they use for a particular day in a particular location. Different forecasters use quite different criteria to arrive at an icon. People seem to want a simple answer, but the answer isn’t really simple.
I listen to what the telly forecasters actually say, which is great for an overall picture and giving confidence levels, and I also look at the predicted charts.