Do you live in the Lake District by any chance ? I only ask because it is pretty much the wettest place in Britain - something to do with all that ocean to the west and those nice hills I believe.
The BBC get their forecasts from the Met Office, which has something like 80 weather stations dotted around the country. The information provided by them, satellites and various other sources go to make up the general forecast, which is what you get on TV and radio. And general means general, not particularly specific to any one place.
If you want a forecast which is more local to you, tune in to your local radio stations. Or go to the Met Office site
http://www.metoffice.org.uk/ and click on the Weather tab. On the page which comes up you will find a link to the UK region and location forecasts. When you get there, select your region, then select the town nearest to you or enter a post code and away you go.