Checking on "La Chaine Meteo" forecast, today was wall to wall sunshine 27 degrees. Same on Google Earth weather reporting. I think Dave's Meteo link is run by a bit of a cynic. Weather at Nevers track on the French Grand Prix run up to for tomorrow's race was looking really good on the bit I saw on TV.
Having said all that, weather here is rubbish and the forecast for tomorrow is very windy with showers.