South Padre Island, TX tide times

South Padre Island is the southern end of Padre Island, the long barrier sand spit that runs more than 200 kilometres along the south Texas coast. The town occupies the southernmost five kilometres of the island, just north of Brazos Santiago Pass — the inlet that separates South Padre from Boca Chica Beach and the mouth of the Rio Grande. The Gulf of Mexico is on the east side, the shallow Laguna Madre on the west, and the geometry produces a narrow ribbon of beach-and-bay community in one of the most remote coastal stretches in the lower 48.

The tide here is small and diurnal, the typical Gulf signal, with mean range about 0.38 metres above MLLW at the Brazos Santiago Pass gauge and a great diurnal range of 0.45 metres on the bigger days. Most days produce one notable high and one notable low spaced roughly 24 hours apart. On the moon's quarter phases the pattern can briefly turn mixed diurnal. The Laguna Madre on the bay side has even less astronomical tide than the Gulf side, because the long shallow lagoon attenuates the signal heavily, and most of the practical water-level variation in the lagoon is wind-driven. South Texas is windy on average, so wind tides regularly exceed the astronomical signal.

Brazos Santiago Pass is the geographic feature that ties the lagoon to the Gulf. The pass is dredged and jettied for the federal channel into the Port of Brownsville, and tidal current through the throat reaches 1.5 to 2 knots on the ebb despite the small tidal range. The Isla Blanca Park jetty on the South Padre side is one of the most productive shore-casting positions on the Texas coast: tarpon and snook in summer, redfish and pompano year-round, Spanish mackerel and bluefish on the seasonal runs. The pass is also the working entrance for shrimp boats out of Port Isabel and Brownsville, and the offshore charter fleet running for kingfish, ling, and snapper at the offshore reefs and the jack-up oil platforms 40 to 80 kilometres out.

The Gulf-facing beach runs north from the jetties for roughly 50 kilometres before reaching the closed access of Padre Island National Seashore (the long undeveloped middle stretch of Padre Island). The beach is open to vehicles north of the developed town section, a Texas tradition, and surf fishing from a 4WD drop is the standard approach. Spring break draws large crowds from inland Texas and Mexico in March; the rest of the year the beach is wide, quiet, and built on the same long-period Gulf swell that produces the unremarkable but consistent beach break south Texas surfers work.

The Laguna Madre side is the world capital of the kite, kayak, and SUP fishery for redfish on the flats. The lagoon is hyperhaline (saltier than seawater because evaporation exceeds inflow), shallow over most of its length, and supports vast seagrass beds that hold redfish year-round. Wading flats anglers and kayak anglers use the shallow grass on incoming tidal phases, when fish push onto the flats to feed in warming water. The South Padre Island bay side is also the consistent kiteboarding venue on the Texas coast — flat shallow water, steady afternoon onshore winds, no jellyfish problem.

The Sea Turtle Inc rescue and rehabilitation centre on Padre Boulevard is one of the longest-running sea-turtle conservation operations in Texas. Nesting Kemp's ridley turtles use the open beach north of town from April through July; the centre runs daily tours and releases rehabilitated turtles into the Gulf when ocean conditions and tide permit. Birding is also a draw — South Padre is a recognised Gulf migration funnel, with the South Padre Island Birding and Nature Center boardwalk on the bay side covering tidal mudflat, salt marsh, and dune habitats in a single accessible loop. Spring and autumn migrations bring concentrations of warblers, raptors, and shorebirds that the Coastal Bend's larger landscape disperses too widely to see in one visit.

Predictions on this page come from NOAA CO-OPS station 8779749 SPI Brazos Santiago (harmonic predictions, accurate to within minutes), the closest active gauge. The Port Isabel reference station (8779770) on the lagoon side controls the harmonic constants. Hurricane season runs June through November and the south Texas coast is vulnerable to landfalls from Mexican Gulf systems.