How to find the nearest location which has sunny forecast
Here is a scenario, I live in Seattle which is mostly cloudy or rainy these days. And I want to spend next weekend at a location, which should be close to my city but has reasonable probability of sunshine. I have found websites which give me forecast for a given location for next 10 days; but that requires me to keep trying the locations around me one by one, while increasing the diameter. I also found websites which show me the forecast for the whole state but only for next 1 or 2 days. So that is not very useful.
The accuracy of forecasts 10 days in advance isn't really there yet. So the best you can do is look at cloud cover the dynamics and prevalent winds.
Sunspot - Find Good Weather in Your Area https://appsto.re/us/1ohaib.i
I made this app to address the problem. I'm also from Seattle. This does pretty much exactly what you want.