Port Royal Sound, Hilton Head Island, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL map preview
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Port Royal Sound, Hilton Head Island, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL Marine Weather Route Forecast

Popular Georgia bypass route; offshore avoiding shoals.

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 Port Royal Sound, Hilton Head Island, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL.

Generated: 2026-07-21T11:05:49.854871+00:00 • Distance: 102.1 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 14.9568089 kts 0.8 m 0.3 kts NE NE 29.5 / 31.0 °C
2026-07-21T16:00:00+00:00 17.386615400000004 kts 1.12 m 0.6 kts N N 29.5 / 30.3 °C
Locked forecast rows are available to signed-in users.

Route Passage Summary & Sea State

Expect significant time on the nose, expect a more demanding trip. Winds range from 12 to 21 kts with waves 2.6 to 4.1 ft with period of 4 to 5 seconds. Overall, wind and waves mostly aligned or partially aligned. Wind angles: 50% reaching, 50% on the nose. Sea state: 83% aligned, 17% cross-seas.

Historical Forecasts Download GPX File

Related Routes

St. Mary's Inlet, GA /FL and Fernandina Beach, FL to Port Royal Sound, Hilton Head Island, SC
102.1 NM 9 waypoints
Charleston Harbor, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
151.6 NM 7 waypoints
Marsh Harbour, Abacos, Bahamas to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
354.2 NM 7 waypoints
Norfolk / Hampton, VA to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
532.1 NM 10 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.