Weather app not available any more
Unless you know the source of data for the weather app, results for the UK are unlikely to be much cop. Weather Apps (for whatever OS) DON'T do their own forecasts, because Meteorological models are incredibly expensive to run. The Model producers (UK Met Office is one, the most common is GFS from the US) "sell" their feed to app producers. GFS produces a model run every 3 hours, XC weather only buy a feed every 12 hours; they also don't buy the best resolution. So in the example of GFS that is a 25km x 25km square (625 square kilometers) and the "assumption" is that the 7 variables for that square (pressure, temp, wind direction, wind speed, precipitation, humidity are 6) are identical all across that square. Everyone knows that you can get rain one side of a street and not the other.
In summary, don't waste your time, use the UK Met Office phone app which can resolve down to 100m squares.
In summary, don't waste your time, use the UK Met Office phone app which can resolve down to 100m squares.