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: 2026-09-12T10:44:01.624430+00:00 • Distance: 105.8 NM • Departure: 2026-09-12T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Ocean Current Air/Water
2026-09-12T12:00:00+00:00 7.775380800000001 kts 0.36 m 0.8 kts SSW SSW 18.0 / 18.7 °C
2026-09-12T16:00:00+00:00 8.3153378 kts 0.34 m 0.6 kts N N 18.2 / 19.2 °C
Locked forecast rows are available to signed-in users.

Route Passage Summary & Sea State

Expect a majority of reaching conditions with steady motion. Winds range from 7 to 15 kts with waves 1.1 to 2.4 ft with period of 4 to 6 seconds. Overall, wind and waves mostly aligned or partially aligned. Wind angles: 33% following, 67% reaching. Sea state: 67% aligned, 33% cross-seas.

More Detail

Points of Sail

CategoryPoint of SailWind AnglePortion of Passage
On the NoseNo-Go Zone0–45°0%
ReachingClose Hauled45–80°0%
ReachingBeam Reach80–110°17%
ReachingBroad Reach110–145°50%
FollowingRun145–180°33%

Sea State & Wave Motion

Sea StateWind vs. WavesBoat MotionPortion of Passage
AlignedWaves run with the windSteady, organized67%
Cross SeasWaves cross the windRolling33%
OpposedWaves against the windChoppy, confused0%
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.