Jacksonville & Northeast Florida Tide, Marine, and Launch Forecast

Settings

Your spot

Home station

Your spot

Not calibrated

Calibrate to match the water at your spot.

Change station & offsetSet the gauge and a manual correction

Home Station

Which NOAA gauge JaxTides reads from. Pick the gauge nearest your dock, ramp, or favorite fishing spot.

Offset at Home

Time correction in 5-minute steps. + pushes times later, − pulls them earlier.

±0 min

Pick a home station to set an offset.

Common the everyday few

Wind units

Radar auto-play

Animate radar on load

Picker bar

Quick widget toggles up top

Notifications alerts while the app is open

Enable notifications

Fires while JaxTides is open in a tab or installed

Weather warnings & alerts

All NWS warnings, watches, advisories & special weather statements for your area

Tropical watches & warnings

Hurricane / tropical-storm watch or warning for NE FL

Launch window opening

When a tracked launch becomes safe today

Surge over threshold

When observed surge clears your tag threshold

Appearance

Accent color

Theme for tides, charts & buttons

More

Advanced & displaySurge tag threshold

Flood Tides events get a tag like +0.7 ft surge → 6.2 ft actual, but only when surge clears this value. Default 0.7 ft, 0.1 ft steps.

0.7 ft

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Turn a widget off to remove it from the main page entirely. Drag the grips to reorder.

App version & updatesRunning —

Tap to pull the latest version.

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Restore default widget order and visibility.

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FAQ

Home Station + Offset at Home

What this pair does. Together, Home Station and Offset at Home customize JaxTides to your specific fishing spot. Home Station picks the closest NOAA gauge; Offset at Home applies a small time correction so the gauge's predictions match the water at your actual dock or launch. Set both once, and the Current Tide hero, the tide schedule, and your launch-window timeline all show times tuned to where you fish.

Home Station — which gauge to read from. The picker covers the full NE Florida corridor from Fernandina Beach in the north to Matanzas Inlet in the south — grouped into Amelia & Nassau, the St. Johns mouth & Jacksonville, the Beaches & ICW, the St. Johns River upriver, and St. Augustine & south — including the Atlantic beaches, the St. Johns River and its tributary creeks (Ribault, Moncrief, Dunn, Julington, Ortega), the Intracoastal, and the Matanzas River. Pick the one nearest your dock, ramp, or favorite spot. Some stations are continuous hourly (NOAA publishes a full hourly tide curve); others are tagged (hi/lo), where NOAA only publishes the high/low events and JaxTides interpolates the rest of the curve — see the (hi/lo) FAQ entry below.

Offset at Home — a small time correction. Adjustable in 5-minute increments. Positive (+) pushes the listed times later; negative (−) pulls them earlier. Default is ±0 min. The offset only affects tide times for your home station — switching the main picker to a different station shows that station's raw NOAA predictions with no offset applied. The offset shifts the curve in time; it does not add or subtract height. This can change the estimated height at a given clock time.

Why offsets are needed. NOAA gauges sit at fixed locations — a pier, a bridge piling, a channel marker. Your dock or launch is almost certainly somewhere else: up a creek, around a bend, behind a marsh. The same tide event reaches your spot a few minutes earlier or later than the gauge. The offset helps align the station’s predicted water-level timing with observations at your spot. It does not measure current direction or speed.

How to calibrate (step by step).

In JaxTides, check the listed time of the next low tide for your home station.
Go to your dock, ramp, or fishing spot at low tide and watch the water carefully.
Look for dead low — the moment the water pauses, then starts to rise. Track the water level against a fixed reference. Do not use the moment the current stops: slack current and lowest water can occur at different times.
Note the actual clock time you observed the lowest water level.
Open Settings, find the Offset at Home stepper, and nudge it (one click = 5 minutes) until JaxTides' listed low-tide time matches what you saw. Use + if your spot's tide is later than the gauge; − if earlier.
Set once and you're done — the same offset applies to every future tide event for your home station.

Why dead low and not dead high? Either water-level extreme can be used as a reference; neither necessarily coincides with slack current. But dead low is the better target in practice for two reasons:

1. Visibility. At dead low, exposed structure (oyster bars, dock pilings, marsh banks, mud flats) gives you fixed visual references to see the water stop receding. At dead high the water covers most of those references — much harder to pin the exact moment.

2. Use-case alignment. The decisions that bite — "can I float over this bar?", "is the ramp deep enough?", "is the flood pushing yet?" — happen at and around dead low. Calibrating where it matters most is the right call.

Caveat for tidal creeks. In shallow channels (parts of the ICW and St. Johns tributaries), flood and ebb don't propagate at the same speed, so the offset measured at dead low may differ by a few minutes from one measured at dead high. Calibrating at dead low gives you accurate dead-low timing — exactly what launch decisions hinge on. If you want high-tide timing equally accurate, observe a dead high too and check whether your low-water offset still aligns; if not, decide which side matters more for your fishing and calibrate there.

Conditions that can throw the calibration off temporarily.

Strong sustained wind. Onshore wind pushes water in (delaying lows, raising and slowing highs); offshore wind does the opposite. After a few days of unusual wind, your calibration may temporarily look "wrong" — wait for normal conditions before adjusting the offset.
Atmospheric pressure. Low pressure raises water levels and can subtly shift slack timing; high pressure does the reverse. Effects are small but real.
Heavy rainfall / river flow. Spots in the St. Johns or its tributaries see freshwater inflow disrupt tide timing after major rain events. The fix is patience, not a new offset.
Spring vs neap tides. Spring tides (around full and new moons) have larger ranges; neap tides (around quarter moons) have smaller. The offset is approximately stable across these, but for an extreme location you may want to verify your calibration during both.

Re-calibrating. You shouldn't need to re-calibrate often — the physics doesn't change. But if you notice JaxTides times drifting from observation by more than 5–10 minutes consistently across normal weather, re-check on a calm day. The offset is stored locally in your browser, so it persists between visits unless you clear site data or use a different device.

Scope summary. Home Station = which gauge. Offset at Home = how many minutes to shift that gauge's predictions for your spot. Together they adjust predicted tide timing for your spot; they do not guarantee future water levels or current timing.

What does (hi/lo) mean?

NOAA publishes a continuous hourly tide curve for most stations — but for some locations (any station tagged (hi/lo) in the station picker, such as Atlantic Beach, Pablo Creek, Fort George River, Julington Creek, or Fort Matanzas) NOAA only publishes the high and low tide events. JaxTides fills in the hourly values between peaks using sinusoidal interpolation.

The high/low times and heights are NOAA predictions, not guaranteed observations. JaxTides estimates intermediate heights between those events. Wind, pressure and river flow can make the water differ from the prediction. Stations without the (hi/lo) tag use NOAA's hourly curve directly.

What this means for safety thresholds: launch windows use estimated crossings of your set station water level on the same curve as the chart. When a station has no usable measured or modeled water level, that curve uses NOAA predictions, including interpolated heights at hi/lo stations. Errors in those heights can change crossing times. The threshold is a station level in feet MLLW, not a measurement of depth at your ramp.

If your spot is one of the (hi/lo) stations, keep the tide station that represents your waterway; a different station’s hourly curve may not represent your spot. Apply an Offset at Home only when supported by local water-level observations (see entries above).

Data sources

Tides, water level, water temperature: NOAA CO-OPS (Tides & Currents). Tide predictions are pulled per station; observed water levels and water temperatures are pulled from the small subset of stations that publish real-time gauges (Fernandina Beach, Mayport, Dames Point, Downtown Jacksonville, Buckman Bridge). When water temp isn't available at your station, JaxTides uses a configured nearby sensor. Tap a conditions reading to see its actual source and observation time.

Marine forecast, advisories, tropical outlook: NWS (Jacksonville office). Includes the offshore zones, coastal waters, special marine warnings, and Atlantic tropical outlook.

Wind: The Windy background map displays the ECMWF wind forecast model. The wind forecast chart is the NWS hourly forecast (api.weather.gov) for the selected station, refreshed hourly.

Refresh cadence: tide and wind data refresh on a rolling cache (typically tens of minutes between fetches per station). Marine advisories refresh frequently because warnings can change quickly.

Advisory only — verify before boating. JaxTides is a planning aid, not a substitute for live observation, NWS warnings, or your own judgment on the water.

About JaxTides

Free, independent tides, marine, and launch-window app for Northeast Florida — Fernandina Beach through Jacksonville, Mayport, and St. Augustine to Matanzas Inlet.

Built and maintained by one local angler. No sign-up, no paywall, no ad networks — just privacy-respecting, cookieless analytics (Do Not Track honored) so I can see what's useful and fix what isn't. The single priority is accuracy — every number on screen should match reality, and when it doesn't, the bug-report channel up top is the fastest way to flag it.

Found a problem with the data, the layout, or have a feature you want? Use the Email me directly or Facebook rows at the top of this panel. Reports get read same-day in most cases.

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© OpenStreetMap via OpenFreeMap · Radar: RainViewer

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ECMWF model