| NWS Forecast for: 18NM NNE Portsmouth NH Atlantic Ocean Issued by: National Weather Service Gray/Portland, ME Last Update: 6:52 pm EST Mar 7, 2026 |  |
Tonight: SW wind 15 to 20 km/h decreasing to 10 to 15 km/h after midnight. Winds could gust as high as 35 km/h. A chance of rain between midnight and 4am. Patchy fog before 2am. Seas 1 m or less. Sunday: SSW wind 10 to 15 km/h becoming W 20 to 25 km/h in the morning. Winds could gust as high as 35 km/h. Patchy fog before 8am, then Patchy fog between 9am and 10am. Seas 1 m or less. Sunday Night: SW wind around 15 km/h, with gusts as high as 30 km/h. Mostly clear. Seas 1 m or less. Monday: SSW wind 15 to 18 km/h increasing to 17 to 20 km/h in the afternoon. Winds could gust as high as 35 km/h. Mostly sunny. Seas 1 m or less. Monday Night: SW wind 15 to 20 km/h decreasing to 10 to 15 km/h after midnight. Winds could gust as high as 35 km/h. Mostly clear. Seas 1 m or less. Tuesday: WSW wind 5 to 10 km/h becoming S in the afternoon. Sunny. Seas 1 m or less. Tuesday Night: S wind around 10 km/h becoming E after midnight. Partly cloudy. Seas 1 m or less. Wednesday: E wind 10 to 15 km/h becoming SE in the afternoon. A chance of rain. Seas 1 m or less. Wednesday Night: SSW wind around 15 km/h, with gusts as high as 30 km/h. A chance of rain. Seas 1 m or less. | |
| Marine Point Forecast: 43.31°N 70.57°W Associated Zone Forecast which includes this point | |
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