Is a 15C sleeping bag warm enough?

Sleeping bag for the Camino de Santiago

The question was:

I’m walking the camino frances from mid-March to late April. I prefer to bring my own sleeping bag, rather than using albergue blankets. What rating of sleeping bag do you recommend for the allergies in early Spring? Is 15C too light?

Read the conversation about sleeping bag on the Camino de Santiago in our Camino forum.