I walked Saria to SdC in September and weather wise it was v hot. Lots of pilgrims along the way which did not bother us, we only purposefully stayed away from the large and noisy groups preferring silence.
We pre-booked B&Bs and did not stay at albergues and had no issues there. I was unwell...
I am planning on doing Lugo to Santiago in September. Also hoping to get an idea of what the route is like.
I think September is still a popular time of the year for pilgrims.
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