Provincetown Harbor, MA to Portland Harbor, ME map preview
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Provincetown Harbor, MA to Portland Harbor, ME Marine Weather Route Forecast

Coastal offshore run; crosses through Jeffreys Ledge and Stellwagen Bank.

Latest Automated Forecast

Optimized for marine passage planning, vessel routing, and coastal or offshore weather tracking. This automated marine weather routing tool updates daily using premium data models. Below is the weather, wave, and ocean current layout for a standard vessel transit from Provincetown Harbor, MA to Portland Harbor, ME.

Generated: 2026-07-28T11:23:08.535388+00:00 • Distance: 105.8 NM • Departure: 2026-07-28T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Ocean Current Air/Water
2026-07-28T12:00:00+00:00 7.5054023 kts 0.4 m 0.9 kts S S 21.6 / 20.0 °C
2026-07-28T16:00:00+00:00 9.6652303 kts 0.74 m 0.4 kts NNW NNW 18.4 / 20.7 °C
Locked forecast rows are available to signed-in users.

Route Passage Summary & Sea State

Expect mixed conditions with no major headwinds. Winds range from 8 to 18 kts with waves 1.3 to 4.2 ft with period of 5 to 6 seconds. Overall, wind and waves mostly aligned or partially aligned. Wind angles: 50% following, 50% reaching. Sea state: 83% aligned, 17% cross-seas.

Historical Forecasts Download GPX File

Related Routes

Portland Harbor, ME to Provincetown Harbor, MA
105.8 NM 10 waypoints
Boothbay Harbor, ME to Portland Harbor, ME
33.9 NM 10 waypoints
Portsmouth, NH to Portland Harbor, ME
54.2 NM 14 waypoints
Provincetown Harbor, MA to Cape Cod Canal, MA
22.3 NM 4 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.