Hawk, I went for 3 weeks at the start of August and believe me the weather spoiled it, it was hot, Hot, DAMNED HOT, from the mid 30s to 40+deg, OK if you like riding half naked into a flame thrower.
We toke the Shuttle as this was the cheapest way at that time of year (£108 return). The trip through France was Arrass, St Quentin, Reims, Troyes, Auxerre, Nevers, Clermont and the beautiful City of le Puy, which is a breathtaking place to see, from here on the scenery is fantastic but not that much before, except for the Ardeche region. On to Montpellier and then the beautiful walled city of Carcassone, where they filmed Robin Hood, Prince of Thieves, then the Pyrenees and Andorra (some great duty free shopping here) OH and stopped at a place called Ax le Thermes, where you can bath your aching feet in 78deg hot water spring, then down on to Spain.
From there we toke the N11 to Saragossa....what a road, full of conveys of trucks, hundreds of them, very few cars, the heat was unbelievable as we where out in the planes...the flatland. As we overtoke the convoys at high speed the heat would hit you like Dante's inferno, at times the heat would nearly sweep you of the bike....this went on for mile after mile, the road ahead would become invisible due to the heat haze.
Saragossa back to the Pyrenees to lourdes and up to Paris, almost 3000 miles
The Pyrenees are a must do before you go tits up and the French roads and drivers are incredible.
Would I do it again.....NOT IN AUGUST