| NWS Forecast for: 18NM NNE Portsmouth NH Atlantic Ocean Issued by: National Weather Service Gray/Portland, ME Last Update: 6:39 pm EDT Aug 11, 2026 |  |
| Tonight: WNW wind around 10 km/h. Mostly clear. Seas 1 m or less. Wednesday: W wind 5 to 8 km/h becoming S 7 to 10 km/h. Sunny. Seas 1 m or less. Wednesday Night: SSW wind 5 to 10 km/h becoming WNW after midnight. Partly cloudy. Seas 1 m or less. Thursday: WNW wind 5 to 8 km/h becoming SSW 7 to 10 km/h in the afternoon. A chance of showers after 5pm. Seas 1 m or less. Thursday Night: Variable winds 5 km/h or less. A chance of showers before 7pm, then a chance of showers after 3am. Seas 1 m or less. Friday: WNW wind 10 to 15 km/h. A chance of showers before 8am. Seas 1 m or less. Friday Night: NW wind around 10 km/h. Mostly clear. Seas 1 m or less. Saturday: NW wind 5 to 10 km/h becoming S in the afternoon. Sunny. Seas 1 m or less. Saturday Night: Variable winds 5 km/h or less. Partly cloudy. Seas 1 m or less. | |
| Marine Point Forecast: 43.31°N 70.57°W Associated Zone Forecast which includes this point | |
Visit your local NWS office at: https://www.weather.gov/gyx/ |
