A northerly and variable flow prevails over the whole area.
For Viana do Castelo :
No gale warning.
For the night from Monday to Tuesday NNE force 3 in the early part of the night becoming force 2. Gusts reaching 11 knots in the early part of the night.
Slight sea. Low, fairly long swell from NW. Excellent visibility becoming good in the middle of the night then good. Daytime of Tuesday 18 august : The weather will be good.
Fair weather with mostly clear skies. In the evening, skies with few clouds.
N force 2 in the morning becoming NNW force 3 in the middle of the day. Gusts reaching 14 knots in the evening. Slight sea. Low, fairly long swell from NW. Good visibility becoming excellent in the middle of the day.