Portsmouth Marine Forecast
New Hampshire · 43.078°, -70.752° · National Weather Service
Next 24 hours
7-Day Marine Outlook
Wind, temperature, and conditions for Portsmouth.
About the marine forecast for Portsmouth
This is the National Weather Service forecast for Portsmouth (New Hampshire), covering wind, wave height, temperature, and conditions over the coming week. Wind and seas are what make or break a day on the water, so start there. Remember that gusts, not the average, are what knock you around, and that wind blowing against the tide stacks the seas up steeper than the numbers suggest. Wave height here is the significant wave height, so some individual waves come through taller.
Planning a trip out of Portsmouth? Pair this with the Portsmouth tide chart so you've got the water and the weather in one look.
Frequently asked
What is the wind forecast for Portsmouth today?+
Today at Portsmouth, expect wind from the S at 10 mph, with patchy fog. See the hourly breakdown above for how it changes through the day.
Where does this Portsmouth marine forecast come from?+
It's the official National Weather Service point forecast for Portsmouth's coordinates, covering wind, temperature, and conditions for the next 7 days. It's the same data marine forecasts are built on.
Is it a good day to go boating at Portsmouth?+
Check the wind first — it's what makes or breaks a day on the water — then the conditions and any advisories. Match the forecast to your boat and experience, tell someone your plan, and always leave yourself a way back.
See the wind on your chart
Pathr paints live wind, waves, and radar right on the Portsmouth chart, and routes you around the shallows. Free to try for two months on iOS.