These two websites may help in the planning of your days fishing.
The first is http://www.xcweather.co.uk/ , this gives wind direction and strength and is updated every 15 mins .
The next is http://www.metoffice.gov.uk/ which has a rainfall radar updated every 30 mins. To find the rainfall radar click on latest/recent on the right hand side of the page and the it should come up with the rainfall radar option. I think, if not just keep looking.