[Gocamino] Less crowded/cooler route?

[Joyce Cheney]

I've planned to walk from Roncesvalles to Santiago in March, but it looks
like I'll have to walk later instead - June, maybe even July-August. I don't
mind dry heat, but I do very much mind humid hot and I do very much mind
crowds! Can anyone recommend a less-traveled, yet fairly well-marked route
with refugios (don't want to camp out) that will not be crowded? I've
thought of walking from Le Puy to wherever in Spain it starts to get crowded
and then taking the train/etc. thru the rest of Spain and walking the last
100 km. to Santiago. Or the Portuguese route? (Is the one from near Sevilla
too hot even in June?)  Thanks for your advice.
Joyce Cheney