St. Marys, GA — Weather, Tides, Traffic, Gas Prices & Local Events
St. Marys is Georgia's southernmost coastal town — a small, historic waterfront city at the mouth of the St. Marys River, right on the Florida line. It's best known as the mainland gateway to Cumberland Island National Seashore: the ferry to Cumberland's wild beaches, ruins, and feral horses leaves from the St. Marys waterfront. The town itself is a walkable grid of old houses and live oaks along the river, with a working shrimp fleet, a submarine-base neighbor at Kings Bay, and a quiet, end-of-the-road feel. Tides run strong here where the river meets the Atlantic, shaping the shrimping, the boating, and the ferry schedule out to Cumberland.
Getting to St. Marys
St. Marys sits at the end of GA-40, about ten miles east of I-95 (Exit 1, the last Georgia exit before Florida) in the far southeast corner of the state. It's genuinely the end of the road — GA-40 runs down to the waterfront and stops at the river — which is a big part of the town's quiet, tucked-away character. Kingsland, its larger neighbor up at the interstate, handles most of the chain stores and through traffic.
Downtown is small and flat and made for walking: a tidy grid of streets running down to the riverfront, where the ferry dock, the restaurants, and the waterfront park all sit within a few blocks of each other. For most visits, you park near the water and explore on foot.
Gateway to Cumberland Island
St. Marys' main draw is what lies offshore: Cumberland Island National Seashore, Georgia's largest and southernmost barrier island, reachable only by boat. The National Park Service ferry leaves from the St. Marys waterfront and is the primary public way to reach the island, so the town functions as the staging point — where you catch the boat, and where reservations and timing matter, since day-visitor numbers are capped.
Cumberland itself is wild and undeveloped: seventeen miles of empty beach, maritime forest, the ruins of the Carnegie family's Dungeness mansion, and the famous feral horses that roam free. Knowing the ferry schedule and the tides is part of planning any trip across, which is why a coastal town like St. Marys lives by the water's rhythm.
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The historic waterfront and downtown
Founded in 1787, St. Marys is one of Georgia's older towns, and its compact historic district along the river preserves that age — old frame houses under live oaks, churches, and the riverfront where the shrimp boats still tie up. Waterfront Park, with its gazebo looking out over the marsh and the river toward Florida, anchors the foot of the main street.
The town keeps a working-waterfront character alongside the tourism: a local shrimping fleet, small museums (including a submarine-themed museum reflecting the Navy presence next door), and a slow, friendly pace. It's the kind of place where the big events — the seafood festival, the Christmas events on the waterfront — turn the whole small downtown out.
Kings Bay and the working coast
Just north of town is Naval Submarine Base Kings Bay, the Atlantic homeport for the Navy's ballistic-missile submarine fleet — a major installation that shapes the area's economy and population, bringing Navy families and civilian jobs to St. Marys and Kingsland. It's a defining, if low-profile, neighbor: you won't tour it, but it's a big part of who lives here and why.
Between the submarine base, the shrimping industry, and the Cumberland Island tourism, St. Marys is a real working coastal town rather than a resort — which is much of its appeal for people who want the marsh, the river, and the quiet without the crowds and development of the bigger beach destinations.
Tides, the river, and the weather
St. Marys sits on tidal water where the St. Marys River and the surrounding marshes rise and fall with the coast's large tides. That matters for the shrimp boats, the recreational boaters and anglers working the river and the sounds, and anyone heading out toward Cumberland — the water level shapes the day. The marsh views from the waterfront shift completely between high and low tide.
The climate is the coast's humid subtropical pattern: hot, humid summers with afternoon storms, mild winters that rarely freeze, and a hurricane season from June through November worth watching this far down the Atlantic coast. Spring and fall are the gentlest seasons, and the mild winters make the far-south Georgia coast comfortable when the rest of the country is cold.
St. Marys: Frequently Asked Questions
What can I check on CityTides for St. Marys, GA?
Weather and alerts, tide times, traffic on GA-40 and I-95, gas prices, dining, events, real estate, and a local Buy & Sell board for the St. Marys and Camden County area.
Does CityTides show tide times for St. Marys?
Yes. Tides run strong where the St. Marys River meets the coast, which matters for shrimping, boating, fishing, and trips out toward Cumberland Island, so CityTides shows the day's highs and lows.
How do you get to Cumberland Island from St. Marys?
By the National Park Service ferry, which leaves from the St. Marys waterfront — the main public way to reach the island. Trips are best planned around the ferry schedule and the tides; CityTides shows local conditions.
Nearby: Jekyll Island, GA · Brunswick, GA · All Georgia cities
Explore the Georgia Coast
See all coastal guides →Live weather, tides, traffic, dining, events, and a local Buy & Sell board for the cities and islands of coastal Georgia — from Savannah down to the Florida line. Tap a city to open it.
Savannah
Historic squares, the working riverfront, and the coastal anchor of the state.
Tybee Island
Savannah's beach — three miles of sand, a historic lighthouse, an easygoing pier town.
Darien
Historic shrimping town on the Altamaha River and its wild delta.
Brunswick
Mainland gateway to the Golden Isles — port city, marsh, and the causeway out.
St. Simons Island
Largest of the Golden Isles. Beaches, the 1872 lighthouse, and Pier Village.
Jekyll Island
Quiet, state-owned island. Driftwood Beach and 20+ miles of bike trails.
St. Marys
Georgia's southernmost coastal town and the ferry gateway to Cumberland Island.
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