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Don't worry, Brian, weekend forecast is yet to come! One of the sites which dares to predict the weather 10 days ahead is predicting thunderstorms during the race. But usually Meteo is pretty reasonable at these things.
I prefer to believe this one:-http://www.accuweather.com/world-forecast-15day.asp?partner=accuweather&traveler=0&locCode=EUR|FR|FR018|LE%20MANS&metric=1
Why does every weather site I look at has a different view of what the weather will be like