A northerly, moderate and very variable flow prevails over the South-West of the basin. Over the South-East, it is easterly, moderate and very variable. Over the North, it is southwesterly, moderate and very variable.
For Portstewart :
No gale warning.
The reliability of the situation is very good.
Skies with few clouds. In the evening, changeable skies clouding over completely.
Risk of showers in the early hours. NNE force 2 in the middle of the day freshening NNW force 4 in the evening. Gusts reaching 19 knots in the evening. Smooth sea. Low, fairly long swell from NW. Excellent visibility becoming poor in the evening.