I use this forecaster http://www.xcweather.co.uk/GB/forecast and remember all forecasts err a little on the pessimistic, I think the weather will be OK with some overcast spells and showers, good for travel up tomorrow from Cambridge and not so bad coming back Sunday,
Beautiful up here ... a glorious morning, walk along the river bank. Cloudy this afternoon, bit cooler, breezy, but another walk along the river bank in half an hour ... to the pub