Nantucket, MA to Block Island, RI map preview
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Nantucket, MA to Block Island, RI Marine Weather Route Forecast

Popular offshore route.

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 Nantucket, MA to Block Island, RI.

Generated: 2026-10-20T10:41:53.731813+00:00 • Distance: 69.8 NM • Departure: 2026-10-20T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Ocean Current Air/Water
2026-10-20T12:00:00+00:00 23.1641553 kts 1.58 m 1.6 kts SW SW 13.1 / 14.4 °C
2026-10-20T16:00:00+00:00 22.732189700000003 kts 1.54 m 0.7 kts SW SW 13.6 / 15.1 °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 17 to 24 kts with waves 5.1 to 6.1 ft with period of 7 seconds. Overall, periods of cross-seas may create some roll. Wind angles: 100% reaching. Sea state: 100% 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°0%
ReachingBroad Reach110–145°100%
FollowingRun145–180°0%

Sea State & Wave Motion

Sea StateWind vs. WavesBoat MotionPortion of Passage
AlignedWaves run with the windSteady, organized0%
Cross SeasWaves cross the windRolling100%
OpposedWaves against the windChoppy, confused0%
Historical Forecasts Download GPX File

Related Routes

Block Island, RI to Nantucket, MA
69.8 NM 11 waypoints
Cuttyhunk, MA to Block Island, RI
37 NM 7 waypoints
Onset Harbor, MA to Block Island, RI
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Beaufort Inlet, NC to Block Island, RI
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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.