Where in Spain? I was wearing shorts and tee during the day in winter but at night it was below zero. So depends if you're out at night or not. October would be more like a good UK summer, just with less rain.
Galicia, the seasons seem to have shifted over there, spring starting later with autumn going well into October. It'll be chilly at night, lots of moisture where we are, 400m up so lots of low cloud and rain, rain, rain!
Where in Spain? I was wearing shorts and tee during the day in winter but at night it was below zero. So depends if you're out at night or not. October would be more like a good UK summer, just with less rain.