For Castro Urdiales :
No gale warning.
For the night from Saturday to Sunday WNW force 2 in the early part of the night turning WSW. Gusts reaching 8 knots in the early part of the night.
Slight sea. Low, short swell from NNW then from N at the end of the night. Good visibility becoming good in the middle of the night then good. Daytime of Sunday 23 august : The atmosphere will remain unstable.
Skies changeable to very cloudy. Light showers all day. In the evening, clear periods developing.
Light showers. WSW force 2 in the morning turning NNW in the middle of the day. Gusts reaching 10 knots in the evening. Slight sea. Low from N. Good visibility becoming good in the middle of the day then good.