St. Mary's Inlet, GA /FL and Fernandina Beach, FL to St Simons Sound, Brunswick, GA map preview
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St. Mary's Inlet, GA /FL and Fernandina Beach, FL to St Simons Sound, Brunswick, GA Marine Weather Route Forecast

Close-to-shore coastal hop; watch for shoals near inlets.

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 St Simons Sound, Brunswick, GA.

Generated: 2026-09-11T10:32:23.327384+00:00 • Distance: 27.8 NM • Departure: 2026-09-11T08:00:00-04:00 • Speed: 6 knots
Time Wind Waves Ocean Current Air/Water
2026-09-11T12:00:00+00:00 2.3218151 kts 0.48 m 0.2 kts N N 24.4 / 29.8 °C
2026-09-11T16:00:00+00:00 3.0777549000000004 kts 0.34 m 0.4 kts ENE ENE 28.7 / 30.2 °C
Locked forecast rows are available to signed-in users.

Route Passage Summary & Sea State

Expect mostly following winds with generally comfortable motion. Winds range from 2 to 9 kts with waves 1.1 to 1.6 ft with period of 6 seconds. Overall, periods of cross-seas may create some roll. Wind angles: 67% following, 33% reaching. Sea state: 33% aligned, 67% 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°33%
FollowingRun145–180°67%

Sea State & Wave Motion

Sea StateWind vs. WavesBoat MotionPortion of Passage
AlignedWaves run with the windSteady, organized33%
Cross SeasWaves cross the windRolling67%
OpposedWaves against the windChoppy, confused0%
Historical Forecasts Download GPX File

Related Routes

St. Simons Sound, Brunswick, GA to St. Mary's Inlet, GA /FL and Fernandina Beach, FL
27.8 NM 7 waypoints
Sapelo Sound, Blackbeard Island, GA to St. Simons Sound, Brunswick, GA
34.2 NM 7 waypoints
St. Mary's Inlet, GA /FL and Fernandina Beach, FL to Charleston Harbor, SC
151.6 NM 7 waypoints
St. Mary's Inlet, GA /FL and Fernandina Beach, FL to Ft. Pierce Inlet, FL
207.7 NM 6 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.