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: 2026-07-21T11:13:08.183534+00:00 • Distance: 69.8 NM • Departure: 2026-07-21T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Ocean Current Air/Water
2026-07-21T12:00:00+00:00 8.5853163 kts 0.72 m 1.1 kts SW SW 21.5 / 18.7 °C
2026-07-21T16:00:00+00:00 15.658753 kts 0.96 m 0.5 kts NE NE 21.8 / 20.8 °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 18 kts with waves 2.2 to 4.4 ft with period of 5 to 6 seconds. Overall, periods of cross-seas may create some roll. Wind angles: 100% reaching. Sea state: 50% aligned, 50% cross-seas.

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
Beaufort Inlet, NC to Block Island, RI
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Bermuda to Block Island, RI
617 NM 3 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.