St. Simons Island, GA tide times

St. Simons Island is the largest of the Golden Isles, a group of barrier islands midway along the Georgia coast, linked to the mainland by a causeway and anchored on the north by the Brunswick River inlet. The tidal regime here is semidiurnal with a mean range of approximately 2.0 to 2.1 metres above MLLW and spring ranges approaching 2.5 metres — consistent with the large-range character of the Georgia coast as a whole. What distinguishes St. Simons from the more exposed Tybee is the layering of tidal environments: ocean beach on the east, Brunswick River tidal channel on the northwest, and an extensive network of tidal creeks and salt marsh on the back-island side, all draining on different timescales and with slightly different tidal timing.

The Brunswick River inlet at the northwest corner of the island connects St. Simons Sound to the Port of Brunswick — the second busiest port in Georgia and the third largest roll-on/roll-off vehicle port in the US. Tidal current in the main Brunswick shipping channel runs 1.0 to 2.0 knots on spring tides. The East River and the Mackay River on the south and west sides of St. Simons are tidal creeks of the scale and character that define the Georgia coast: Spanish-moss-draped live oaks lean over the water at the upper marsh edge, and at low tide the creek banks drop 1.5 to 2.0 metres from the high-water cordgrass to the exposed pluff mud — the dark, pungent clay that smells of hydrogen sulphide and supports the fiddler crabs and diamondback terrapins that form the base of the salt-marsh food web.

St. Simons Lighthouse, built in 1872 at the island's south tip, stands 49 metres above sea level and marks the entrance to St. Simons Sound from the Atlantic. The lighthouse museum is operated by the Coastal Georgia Historical Society and open for climbing; from the top, the full geometry of the tidal sound is visible — the wide Atlantic approach narrowing between Jekyll Island to the south and the St. Simons shoals to the north, with the Intracoastal Waterway channel threading behind both barriers. At low water, the tidal flats visible from the lighthouse tower extend hundreds of metres from the St. Simons shoreline toward the main channel.

East Beach, the primary ocean beach on the Atlantic side of the island, faces east-southeast and receives attenuated Atlantic swell. The beach is wide at low tide — 50 to 70 metres of firm sand from the wrack line to the water's edge — and narrows noticeably at high water, especially during spring tides when the beach face above mean high water is narrow. The tidal pools exposed on the lower beach around spring low water hold sea lettuce, coquina clams, and small killifish. Neptune Park at the village pier provides the main beach access, and the public fishing pier at the south end of the park is active year-round for whiting, sheepshead, and flounder.

Anglers fishing the tidal creeks of St. Simons on the outgoing tide from kayaks or small flats boats routinely catch red drum and spotted seatrout in the 0.5 to 2.0 kg range on soft-plastic shrimp imitations. The drop from high marsh to exposed mud on the falling tide concentrates fish in the remaining channel water, making the last two hours of the ebb the most consistent window. Photographers targeting the live oak and Spanish-moss waterline landscapes will find the most dramatic compositions on the Mackay River and East River sides during the golden hour low tide, when the creek channels reflect the sky and the exposed mud banks provide foreground contrast. Families and paddlers use the protected creeks behind the island; the back-bay launch at the public boat ramp on Frederica Road is the most practical entry point for the tidal creek system.

Tide data here comes from Open-Meteo Marine, a global gridded ocean model. Typical accuracy is plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height. For authoritative data, NOAA CO-OPS station 8679511 at Brunswick — 10 kilometres west of St. Simons — provides calibrated harmonic predictions; the tidal timing and range at St. Simons village closely tracks Brunswick.