Because there are so many Camino routes, it depends somewhat on where you are starting. Another consideration would be the length of your trip and if the weather would become a factor as you walked. If you are looking to avoid crowds, if possible, you might want to skip the summer months. On the other hand, if you are going solo or hoping to be amongst and meet lots of people along the way, you might choose summertime.
A main starting point is St.-Jean-de-Pied-de-Port, France traveling west to Santiago de Compostela, Spain. About 60% of pilgrims walk some or all of this 500-mile route. Here is the annual weather for St.-Jean-Pied-de-Port.
Our starting point, however, is Porto, Portugal, which 20% of pilgrims take. From Porto one walks north to Santiago de Compostela. Porto is over 500 miles from St.-Jean-de-Pied-de-Port, so here is the annual weather for Porto.
For us and our timing, Porto was the best option. We plan on a three-week journey overall, with 150 miles of walking the Way. We had never been to Portugal, and it had the added benefit of visiting another sacred pilgrimage site for us — Fatima Shrine.
We decided to go in late April. The temperature would be ideal — 50s and 60s — and there would not be the volume of pilgrims that summer brings. Though it might rain, we prepared ourselves for that. Another possibility that appealed to us was September/October as the fall temperatures would be a relief from the summer heat and multitudes.
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