A northeasterly and very variable flow prevails over the whole area.
For Castro Urdiales :
No gale warning.
For the night from Monday to Tuesday WNW force 2 in the early part of the night turning WSW. Gusts reaching 9 knots until the middle of the night.
Slight sea. Low, short swell from NNW. Poor visibility becoming poor in the middle of the night then poor. Daytime of Tuesday 18 august : The unsettled weather will become more unpredictable in the second half of the day.
Skies changeable to very cloudy. Risk of showers in the morning, light showers dying away progressively in the afternoon. In the evening, cloudy spells, sometimes dense.
Light showers. W force 2 turning N force 3 in the middle of the day then NNW force 2. Slight sea. Low, short swell from NNW. Poor visibility becoming excellent in the middle of the day then good.