Charleston Harbor, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL map preview
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Charleston Harbor, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL Marine Weather Route Forecast

Strategic Georgia bypass. Stays offshore of the complex and shallow Georgia sounds. Watch for commercial traffic entering the Savannah River.

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 Charleston Harbor, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL.

Generated: 2026-07-21T11:16:29.893614+00:00 • Distance: 151.6 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 11.1771099 kts 0.78 m 0.2 kts NNE NNE 29.5 / 30.3 °C
2026-07-21T16:00:00+00:00 17.5486025 kts 1.18 m 0.7 kts NE NE 29.4 / 29.2 °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 11 to 20 kts with waves 2.6 to 4.7 ft with period of 4 to 5 seconds. Overall, wind and waves mostly aligned or partially aligned. Wind angles: 62% reaching, 38% on the nose. Sea state: 75% aligned, 25% cross-seas.

Historical Forecasts Download GPX File

Related Routes

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
Port Royal Sound, Hilton Head Island, SC to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
102.1 NM 9 waypoints
St. Simons Sound, Brunswick, GA to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
27.8 NM 7 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.