Is 10 days too far ahead to accurately forecast?

[nikki1978]

We are going camping on 27th in the south east just south of reading. Weather forecast keeps changing but currently says no rain. How far in advance can we trust if at all?!

Yes it is too far in advance to tell. I speak from bitter experience of every winter watching the weather and waiting for the snow. It's never accurate that far in advance and I am always disappointed ( I realise I need to grow up!)

If a high pressure settles then you can get quite good accuracy several days out. If it's low pressure dominated then between two- five days for accurate forecasts.