Portsmouth, NH to Portland Harbor, ME map preview
← Back to Route Library

Portsmouth, NH to Portland Harbor, ME

Popular leg for cruisers heading into the Gulf of Maine.

Latest Automated Forecast

Updated daily with ECMWF data for Portsmouth, NH to Portland Harbor, ME. This page shows the latest forecast snapshot, route distance, waypoint count, and the first forecast points so search engines can read meaningful route-specific content without JavaScript.

Generated: 2026-06-13T10:17:02.388547+00:00 • Distance: 54.2 NM • Departure: 2026-06-13T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Current Temp
2026-06-13T12:00:00+00:00 1.8358538 kts 0.48 m 1.2 kts SE SE 22.3°C
2026-06-13T16:00:00+00:00 4.859613 kts 0.56 m 0.6 kts SE SE 14.8°C
Locked forecast rows are available to signed-in users.

Daily Route Forecast Summary

Expect a majority of reaching conditions with steady motion. Winds range from 2 to 9 kts with waves 1.6 to 1.8 ft with period of 6 to 7 seconds. Overall, seas and wind frequently opposed, expect confused motion. Wind angles: 33% following, 67% reaching. Sea state: 67% cross-seas, 33% opposed.

Historical Forecasts Download GPX File

Related Routes

Portland Harbor, ME to Portsmouth, NH
53.8 NM 14 waypoints
Boothbay Harbor, ME to Portland Harbor, ME
33.9 NM 10 waypoints
Provincetown Harbor, MA to Portland Harbor, ME
105.8 NM 10 waypoints
Gloucester, MA to Portsmouth Harbor Inlet, NH
35.9 NM 8 waypoints

Navigation Responsibility

This forecast is for informational purposes only. You are responsible for your own navigation and safety at sea. Always verify weather conditions with official sources, maintain a proper watch, and exercise prudent seamanship. Do not rely solely on this forecast for critical navigation decisions. See our Terms of Service for full details.