5 Day forecast

Today, the BBC weather forecast has a dark cloud with rain at the bottom and a bright sun in the top right hand corner for the London Marathon on Sunday.  I don't actually think this means much especially as today's forecast, yesterday, had the same symbol until the sun came out and the BBC weathermen (or women) changed it. The max temp is predicted at 11 and Min is 3 degrees C. Last year temperatures topped 21.