A northerly, weak and particularly variable flow prevails over the whole area.
For Castro Urdiales :
No gale warning.
For the night from Saturday to Sunday WNW force 2 in the early part of the night becoming force 1. Gusts reaching 6 knots in the early part of the night.
Slight sea. Low, short swell from NNW. Good visibility becoming good at the end of the night. Daytime of Sunday 16 august : The unstable weather will die away during the day.
Skies changeable to very cloudy. Light showers progressively dying out in the morning, possibility of showers in the afternoon. In the evening, cloudy spells, sometimes dense.
Showers towards the end of the night. NW force 1 freshening N force 3 in the middle of the day then NW force 2. Slight sea. Low, short swell from NNW. Good visibility becoming excellent in the middle of the day then good.