The Sun will be only 10.3° above the horizon. Find a spot with a clear west-northwest view; a hill or a building hides totality. ISO 12312-2 glasses are mandatory during the partial phases.
On 12 August 2026, Oviedo (Asturias) will sit inside the path of totality of the first total solar eclipse visible from mainland Spain in over a century. Maximum is at 20:27:51 (Spanish peninsular time) and totality lasts about 111 seconds: the sky darkens like night and the solar corona appears.
Because it happens right before sunset, the Sun will be very low (10.3°). That's why what matters is not just being in the right place, but having the west-northwest horizon clear of hills and buildings.
Data computed for the coordinates of Oviedo (43.3619, -5.8494). Verify with the IGN (Spain) before travelling.