San Antonio, Valparaíso Region tide times

San Antonio is 100 km south of Valparaíso on Chile's Pacific coast — a working port city where the tide matters for commercial reasons before it matters for recreation. The port handles more fresh fruit export volume than any other in Chile: table grapes, apples, and citrus move through here in refrigerated containers bound for Europe and Asia, loaded onto vessels whose keel clearance in the navigation channel depends on where the tide stands. The largest refrigerated cargo ships operate at draught limits that require tide planning on neap lows, when the range compresses to the lower end of the 1.2–1.8 m spring range and channel depth is at its minimum.

The semidiurnal Pacific tide at San Antonio produces a mean spring range of 1.2–1.8 m — the same regime as Viña del Mar 100 km to the north and Cartagena 5 km to the north of the port. High spring water reaches approximately 1.5–1.6 m above chart datum; neap lows sit around 0.2–0.3 m. The Humboldt Current offshore keeps surface temperatures in the 13–16°C range, with pronounced upwelling events in the austral winter pushing surface readings below 13°C for short periods. The current runs north at 0.5–1.5 knots parallel to the coast, strongest offshore, weaker inshore where the seafloor shoals.

The Río Maipo discharges into the Pacific 10 km south of the port at Llolleo. The Maipo is the longest and most hydrologically significant river in central Chile — it drains the snowmelt from the Andes above Santiago and supplies most of the freshwater to the Santiago metropolitan area. Where it meets the Pacific at Llolleo, the estuary opens into a shallow tidal flat that floods on each rising tide and drains on the ebb. The flat is a bird-watching zone: black-necked swans (Cygnus melancoryphus) feed on the aquatic vegetation in the shallower sections, Chilean flamingos (Phoenicopterus chilensis) probe the mudflat margins, and a range of shorebirds — oystercatchers, godwits, sandpipers — work the tide line as it moves. The incoming tide compresses the accessible mudflat area and concentrates the shorebirds toward the upper estuary edges; the two hours after low water, when the flat is draining but still shallow, produce the highest bird density. A gravel track off the Panamericana Sur reaches the Llolleo estuary bank without requiring four-wheel drive.

Twenty kilometres south of San Antonio, on a clifftop above the Pacific at Isla Negra, stands the house Pablo Neruda used as his primary residence for the last decades of his life. The house — known as Casa de Isla Negra — is now a Fundación Neruda museum, open to the public. Neruda accumulated objects obsessively: ship figureheads, bottles, maps, telescopes, compasses, and nautical instruments fill the rooms. The house perches above the Pacific on a cliff of wave-cut rock; the view from the study window Neruda used is a direct westward line to open ocean. A Humboldt penguin colony occupies the rocks below the cliff, visible from the museum grounds. The penguins nest in crevices in the wave-cut platform and are undisturbed by the museum visitors above.

Cartagena — the Chilean coastal town, not the Colombian port — is 5 km north of San Antonio. Playa de Cartagena is a 1 km arc of sand with a pier that projects 150 m into the Pacific at the northern end. Shore fishing from the pier targets corvina, lisa (Mugil cephalus, grey mullet), and reineta (Brama australis, Pacific pomfret) on the incoming tide. The corvina and reineta feed actively in the two hours before high water when the current picks up bait against the pier pilings. Lisa are taken throughout the tidal cycle but concentrate at the pier base during the tide change. Santiago is 100 km inland via the Autopista del Sol — a 90-minute drive on a clear run — which makes Cartagena and San Antonio viable day-trip destinations from the capital on summer weekends.

For paddlers and kayakers, the San Antonio coastline is exposed and requires appropriate experience and equipment. There is no sheltered bay comparable to Pucusana to the north; the coast runs as open cliff and beach with occasional rocky headlands. The Cartagena pier provides a launch reference and some wind shelter on its lee side. Kayaking to Isla Negra from Cartagena (approximately 15 km each way) is an experienced-paddler route — the Humboldt Current runs north and the return leg against it requires planning for wind and current windows. Most visitors reach Isla Negra by road.

Tide data for San Antonio, Valparaíso Region comes from the Open-Meteo Marine API, a gridded model product. Timing accuracy is ±45 minutes, height accuracy ±0.3 m — usable for trip planning, not for navigation.