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

Generated: 2026-07-28T11:10:48.980120+00:00 • Distance: 102.1 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 3.8876904000000003 kts 0.36 m 0.0 kts E E 25.6 / 30.4 °C
2026-07-28T16:00:00+00:00 2.1058323 kts 0.36 m 0.3 kts ESE ESE 28.8 / 30.8 °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 2 to 19 kts with waves 1.2 to 2.5 ft with period of 4 to 8 seconds. Overall, wind and waves mostly aligned or partially aligned. Wind angles: 17% following, 83% reaching. Sea state: 67% aligned, 17% cross-seas, 17% opposed.

Historical Forecasts Download GPX File

Related Routes

Port Royal Sound, Hilton Head Island, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
102.1 NM 9 waypoints
Calibogue Sound, Hilton Head Island, SC to Port Royal Sound, Hilton Head Island, SC
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Charleston Harbor, SC to Port Royal Sound, Hilton Head Island, SC
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Norfolk / Hampton, VA to Port Royal Sound, Hilton Head Island, SC
472.2 NM 11 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.